The monitor has no signal - After connecting the computer with the monitor with

Hello, yesterday, on New Year's Eve, I disconnected the hdmi cable from the monitor and connected it to a laptop with a large tv to watch yt there. The problem is that as he tried to reconnect to the computer and monitor today, there is no signal.

Thank you in advance for any help

First, restart CMOS. To do this, you must unplug the computer's power cord, or turn it off. on the strip, press the power button to discharge the capacitors on the board and in the power supply and then remove the round CR2032 battery for 30 minutes. Then put it in, turn on the power and see. How come crap, you would have to connect the computer to another monitor. If it is the same on the other monitor, check the CMOS battery voltage, it should be 3V. If okay, turn on the computer without graphics. If it does not sound, you have to replace the power supply, memory and processor and if they are ok then the board will be scrapped. Otherwise, artwork to check. Certainly, when the computer starts, the post will stop at Time and date not set and CMOS checksum error, or CMOS checksum bad messages. These are normal CMOS reboot messages, so you have nothing to talk about. It is enough to enter the BIOS at this point, set the BIOS again, save the changes and it will be ok. In general, I do not think that the computer fell like this, so in total, CMOS reset

If what the colleague wrote above does not help, use a different HDMI cable to be sure that the cable is to blame. And you will have it if the monitor "comes to life" on a different cable. You can also connect a laptop with a monitor through this cable and you will see if the image on the monitor from the laptop appears.