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MSI B75A-G43 Motherboard: How to Fix Error 99 with I/O and PS2 Ports During Boot-Up

golu8991 7407 6
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  • #1 16605584
    golu8991
    Level 8  
    Hello,

    I have the following problem: Well, I have a MSI B75A-G43 motherboard and it shows me 99 in the lower right corner when booting, I searched Google and found it to be an I / O error. I reset, flashed the BIOS (via the jumper and by removing the battery) and nothing helps. But it is enough to connect a keyboard or a mouse to the PS2, it all moves, I can install the system, work on it, reads the USB ports, even while working, I can disconnect the keyboard from the PS2 port and it continues to work until I reset / turn off the system by myself.
    Do you have any advice on how to make it work "normally".

    greetings
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  • #2 16605595
    safbot1st
    Level 43  
    You may have a short circuit somewhere. Remove and reinsert the 4 (8) and 24 pin power plugs from the power supply.
    Remove and reinsert RAM, graphics card, then perform CMOS reset again.
    If it doesn't help, take the plate on a wooden table and run "on the spider".

    Added after 1 [minutes]:

    Enter the model and brand of the power supply. Error 99 can also mean power problems.
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  • #3 16605620
    golu8991
    Level 8  
    The board is already running on the "spider" graphics is integrated, the Chieftec 350 W power supply I did what you said but to no avail
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    #4 16605638
    safbot1st
    Level 43  
    Maybe there is a short circuit in PS2. If the motherboard is under warranty, I suggest RMA, because you won't be soldering the entire port.
    Take a look at the PCI-e slots and the socket, if the pins are not bent, because in the network they suggest that it is something on the PCI-e bus.
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  • #5 16606939
    golu8991
    Level 8  
    The pins look okay on the warranty, unfortunately it is not and the theory with a short circuit on PS2 is quite likely
  • Helpful post
    #6 16608153
    310artur
    Level 43  
    Finally, you can hook up a PS / 2 keyboard and that's it. For me, at least I can have a PS / 2 and USB keyboard connected at the same time and both work then. So you put that PS / 2 somewhere behind the PC and let it lie. Simple solutions are good because they are good and simple ;)
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  • #7 16842113
    golu8991
    Level 8  
    I did as my friend said I work on the ps2 keyboard
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Topic summary

The discussion revolves around troubleshooting an MSI B75A-G43 motherboard that displays error code 99 during boot-up, indicating an I/O issue. The user has attempted several solutions, including resetting and flashing the BIOS, but the problem persists. Suggestions from other users include checking for short circuits, reseating power connectors, RAM, and graphics cards, and examining the PCI-e slots for bent pins. One user noted that connecting a PS/2 keyboard allows the system to function normally, suggesting a workaround while the underlying issue remains unresolved. The motherboard is out of warranty, complicating potential repairs.
Summary generated by the language model.
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