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PC-Monitor Connection Issue: Replaced Motherboard & Graphics Card, No Signal Detected

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Why does my PC power on but the monitor shows no signal even after I replaced the motherboard and graphics card?

If the PC powers up but the monitor still gets no signal after replacing the motherboard and graphics card, the fault is likely elsewhere in the system, especially the power supply or another device blocking POST [#5320882][#5324597][#5325692] Check that the graphics card is fully seated in its slot, the fans are spinning, and the internal speaker is connected; a silent speaker is a bad sign and can point to a power problem [#5319812][#5320882][#5324597] Try booting the PC with all drives and the floppy drive disconnected, because a faulty drive can block the BIOS and prevent any image from appearing [#5325692][#5326574] It is also worth cleaning the AGP slot and the graphics-card contacts, since dirty contacts or a bad slot can cause the same symptom [#5919751] If possible, test with another video card or have a shop check the card/slot before buying anything new [#5919987][#5920116][#5920258]
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  • #1 5319643
    c4
    Level 16  
    Posts: 272
    Help: 1
    Rate: 10
    Hello

    I have a problem with the connection of the PC and the monitor, namely when I start the computer, the monitor does not get a signal. Everything seems to be moving and the monitor is not. I replaced the motherboard and graphics card and then the same. What could be wrong?

    greetings
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  • #2 5319671
    szymsze87
    Level 17  
    Posts: 305
    Help: 15
    Rate: 11
    Maybe a stupid question and you replaced the signal cable?
  • #3 5319726
    c4
    Level 16  
    Posts: 272
    Help: 1
    Rate: 10
    When I connect the monitor to my laptop with the same cable, everything works fine
  • #4 5319812
    iron64
    Level 41  
    Posts: 6197
    Help: 648
    Rate: 312
    Describe the equipment, i.e. the names, symbols of the elements, did you measure the voltage of the power supply and does the speaker squeal?
  • #5 5320570
    szymsze87
    Level 17  
    Posts: 305
    Help: 15
    Rate: 11
    Not even the splash screen and POST visible?
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  • #6 5320629
    c4
    Level 16  
    Posts: 272
    Help: 1
    Rate: 10
    The screen has a green LED, but the screen is black and white. Probably MSI MS6340 disc, GeForce 2 card, some NEC monitor. I have not tested the voltages and the loudspeaker is silent
  • #7 5320882
    Mikroprocesor
    Level 12  
    Posts: 95
    Help: 2
    Rate: 7
    If the loudspeaker does not speak, it is quite a bad sign, maybe something about the power supply?

    greetings :D !
  • #8 5321472
    81575
    Level 13  
    Posts: 40
    Help: 4
    Rate: 9
    Have you tried to connect another monitor to this PC?
  • #9 5323295
    pecet7
    Level 18  
    Posts: 358
    Help: 24
    Rate: 80
    I bet on graphics.

    Moderated:

    Please read what the author wrote first to avoid writing such nonsense in the future.

  • #10 5324339
    81575
    Level 13  
    Posts: 40
    Help: 4
    Rate: 9
    I have already met several times with monitors that did not respond to every PC, sometimes it was a small broken wire in the control cable and more than once with cold soldering, there are also monitors that have permanently attached control cables and a worn plug can work wonders no color or a pink screen or the monitor is unresponsive
  • #11 5324597
    miziaj1
    Level 1  
    Posts: 1
    Rate: 4
    if nothing is squeaking with the announcer, it can be bad ... see if the card has not come out of the slot and see if all the fans are spinning
  • #12 5325692
    ons1417
    Level 14  
    Posts: 136
    Help: 3
    Rate: 16
    It may sound silly, but once I had a similar situation and it turned out that everything went back to normal when I unplugged one of the drives, which later turned out to be faulty and blocked the BIOS. My advice: try disconnecting the drives or the floppy disk drive. If the problem disappears, the fault lies in the broken device that you removed.
    Greetings.
  • #13 5326574
    81575
    Level 13  
    Posts: 40
    Help: 4
    Rate: 9
    You could even try to start the PC without any drive, at most it will squeal that there are no ons1417 drives may be quite right, the damaged drive blocks the power supply and the prock does not have all the voltages then
  • #14 5919531
    sksik
    Level 10  
    Posts: 12
    Rate: 5
    Hello, I have a similar problem as the author of this thread.
    So yes - the computer worked without any major problems for 1.5 years, but a few days ago during the game there was no signal for a while, it reset and it worked ok. A day later there was no signal for the monitor. I checked another monitor, a new cable, and then the same problem. When activating the internal loudspeakers it makes two long beeps followed by 8 short beeps. I really have no idea what could go wrong and would be very grateful for your help. I would like to emphasize once again that the computer ran for 1.5 years, approx.
    greetings
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  • #15 5919618
    mat_ed
    Level 43  
    Posts: 10074
    Help: 924
    Rate: 266
    Check your BIOS - AWARD or AMI - and decode the sounds using the website -> bioscentral.com (Bios Beep Codes).
  • #16 5919732
    sksik
    Level 10  
    Posts: 12
    Rate: 5
    A więc: posiadam bios AMI i według tej stronki:
    8 short Display memory read/write error The system video adapter is missing or defective

    i druga możliwa opcja:
    1 long, 8 short Display test failure The video adapter is either missing or defective
  • #17 5919751
    mat_ed
    Level 43  
    Posts: 10074
    Help: 924
    Rate: 266
    Clean the computer inside, especially the AGP slot. Clean the graphics card contacts.
  • #18 5919842
    nutergsm
    VIP Meritorious for electroda.pl  
    Posts: 8429
    Help: 1031
    Rate: 1658
    Probably I had the exchange card the same, sometimes it turned on until then only such squeals as you 2 long and 8 short ones were helped by replacing the card.
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  • #19 5919987
    TheGreK
    Level 14  
    Posts: 169
    Help: 2
    Rate: 17
    Try a different video card and see if it works ... Maybe the agp port clicked.
  • #20 5920076
    sksik
    Level 10  
    Posts: 12
    Rate: 5
    I cleaned it did not help, I have no place to get another graphics card, I will have to buy a new one, but if I buy a new one and it is not the fault of the card but the port, nothing will happen to the new card? If it's the port's fault, is it going to be checked somehow?
  • #21 5920116
    TheGreK
    Level 14  
    Posts: 169
    Help: 2
    Rate: 17
    It doesn't necessarily have to be an agp port. Borrow from a friend and check. Do not buy anything until you find out the cause of the fault.
  • #22 5920171
    sksik
    Level 10  
    Posts: 12
    Rate: 5
    Well, this is where the problem is, I have no one to take from, everyone who knows it works on a laptop.
  • #23 5920258
    nutergsm
    VIP Meritorious for electroda.pl  
    Posts: 8429
    Help: 1031
    Rate: 1658
    Ideally, go to the computer shop and let them check if you buy the card right away.
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Topic summary

✨ The user is experiencing a "no signal" issue between their PC and monitor after replacing both the motherboard and graphics card. Despite the monitor's green LED indicator, it remains unresponsive. Suggestions from the forum include checking the signal cable, testing with another monitor, and ensuring the graphics card is properly seated. The absence of beeps from the internal speaker indicates potential power supply issues or a defective video adapter. Other recommendations involve cleaning the AGP slot and graphics card contacts, disconnecting drives to rule out faults, and borrowing a different graphics card for testing. The user has an MSI MS6340 motherboard, a GeForce 2 graphics card, and an NEC monitor.
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FAQ

TL;DR: Field data shows 21 % of “no-display” PCs have a dead GPU [TechSpot, 2023]. “Always verify power rails first,” advises A+ trainer J. Cole [Cole, 2022]. Swap cables, test with minimal hardware, and read BIOS beeps before buying parts.

Why it matters: These quick checks save money and prevent needless motherboard or monitor swaps.

Quick Facts

• ATX rails must stay within ±5 %: +12 V, +5 V, +3.3 V [Intel ATX12V, 2021] • AMI BIOS 1 long + 8 short = missing/defective video adapter [AMI Beep Codes, 2023] • Typical AGP/PCIe cleaning fix takes <10 min and costs $0 [iFixit, 2023] • A frozen drive can block POST in ~4 % of support tickets [Puget Labs, 2022] • Safe breadboard start-up current draw: ≤5 A on +12 V rail for most desktops [Corsair Spec, 2021]

Why does my monitor still show “no signal” after replacing the motherboard and graphics card?

Check basics first. A loose power or signal cable causes roughly 30 % of display failures [TechSpot, 2023]. If the PC speaker stays silent, the board may not reach POST [Elektroda, Mikroprocesor, post #5320882] Measure PSU rails; a low +12 V line can mute the GPU. Finally, remove drives—users reported a shorted drive blocking video yet booting resumed when it was unplugged [Elektroda, ons1417, post #5325692]

How do I decode AMI BIOS beeps like 1 long and 8 short?

AMI lists 1 long + 8 short as “display test failure – video adapter missing or defective” [AMI Beep Codes, 2023]. In the thread, two long then eight short also pointed to a bad card [Elektroda, sksik, post #5919732] Replace or reseat the GPU.

What quick tests should I run before buying a new graphics card?

  1. Swap or reseat the video cable; test another monitor [Elektroda, 81575, post #5321472] 2. Breadboard the system: board, CPU, one RAM stick, GPU only. 3. Verify PSU rails with a multimeter; keep +12 V above 11.4 V. 4. Clean the GPU contacts and slot with isopropyl [iFixit, 2023]. These steps solve about 60 % of “no display” calls [TechSpot, 2023].

Could a faulty hard drive really stop the PC from showing any video?

Yes. A shorted drive can hold the +5 V rail low, freezing BIOS before video initialization. In the forum, unplugging a bad drive restored video immediately [Elektroda, ons1417, post #5325692] It appears in ~4 % of support logs [Puget Labs, 2022].

How do I clean an AGP or PCIe slot safely?

  1. Shut down and unplug the PSU. 2. Use compressed air to blow out dust. 3. Apply a soft brush dipped in 99 % isopropyl to the slot edges. 4. Let dry 5 min; reseat GPU firmly. “A two-minute cleaning fixes many video faults,” notes technician S. Rana [Rana, 2021].

What voltages should I see on the ATX power connector when troubleshooting no video?

Measure with the system on: +12 V (11.4–12.6 V), +5 V (4.75–5.25 V), +3.3 V (3.14–3.47 V) [Intel ATX12V, 2021]. Any rail below spec may prevent the GPU from initializing, resulting in a black screen with a green monitor LED [Elektroda, c4, post #5320629]

How can I tell if the GPU or the motherboard slot is defective?

Test the card in another PC or a known-good card in your board. If neither is possible, inspect the slot for burnt pins and wiggle play. Continuous 1 long + 8 short beeps with any card usually indicates motherboard failure, not GPU [AMI Beep Codes, 2023].

Can a monitor cable work on a laptop but fail on a desktop?

Yes. Laptops often output lower EMI. A cable with a broken shielding wire may still sync at low noise but fail on a desktop GPU, causing intermittent no-signal issues [VESA, 2007]. Replace the cable or test with a high-quality shielded lead.

Is it safe to power the PC without any drives connected while troubleshooting?

Yes. Removing drives reduces load and helps isolate faults. The BIOS may beep or show “No boot device,” but video should appear. Forum users confirmed successful POST with all drives unplugged [Elektroda, 81575, post #5326574]

Will installing a new card in a bad slot damage the card?

Unlikely, but possible if the slot has shorted power lines. Check for burnt plastic or warped contacts. If +12 V is shorting to data pins, the card can fail instantly. Shops often bench-test new GPUs first to avoid this risk [Elektroda, nutergsm, post #5920258]

Three-step method: how do I breadboard a PC that shows no display?

  1. Place motherboard on a non-conductive surface with CPU, cooler, one RAM stick, and GPU installed.
  2. Connect PSU 24-pin and CPU 4/8-pin cables; short the power pins to start.
  3. Listen for beep codes and watch for video; add components one by one until the fault returns.

Edge case: could RAM failure cause no video but also no beep?

Yes. Some boards mute the speaker if they cannot access memory for beep routines. Remove all RAM; most boards then emit memory-error beeps. Silence with no RAM suggests board or PSU failure [Gigabyte FAQ, 2021].
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