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PC virus affecting motherboard/bios?

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I'm having a little trouble following along, but I think basically:
* Your first PC stopped displaying anything on the screen
* Your second PC has starting having monitor issues after you plugged the hard drive from PC #1 into it

Is that correct?

This sounds like hardware problems to me. You stated the problems are the same for both PCs when testing with a known-good monitor. That means the fault is with the computer. Something is really shot with the first PC that gives no image at all. Do you hear the normal 'beep' a couple of seconds after booting this computer? If so then yeah, it's probably a video card issue. If you don't hear any beeps (and you used to) then it is going to be a CPU/power supply or maybe motherboard issue. You can try swapping things out if you know how and have spares. If not, you may be better off putting your money towards a new (or second-hand) replacement. If you hear multiple beeps after turning the PC on it means something is wrong with the hardware, and the number and sequence of beeps tells you what is wrong. You can look up the beep codes in your motherboard manual to find out what the issue is, although you may be better off taking it to a good computer store as it needs a little knowledge, and probably some spare parts to test with.

The second PC sounds like it has a video RAM issue. This will often manifest itself with dots or squares on the screen (and these may move around). Double-check that the cable going from your PC to your monitor is plugged in firmly and replace it with a spare it you can. Next, I'd probably update your video card driver. If you have a dedicated video card then open up the PC case and ensure it is pushed in firmly.

I doubt the above steps will fix the issue. As mentioned earlier I suspect you have a video RAM problem. So if the above don't help buy yourself a dedicated video card. They are cheap - see You will need to plug it in inside your case, then boot into Windows and install the driver software to make it work. This (and most of the above troubleshooting steps) can be hard for someone that doesn't know computers much, but do not need a professional. If your kids go to school with a kid that is good with computers then they should be able to get it done.

Whether you do it yourself or get help, I suggest do a little homework first. Make sure your computer can accept an addin PCI express video card. And if your PC does not already have one it means the video card is using system RAM, so the system RAM may be faulty. You can try removing sticks one at a time to see if the problem disappears. There is software you can use to test (Memtest 86 for system RAM, I can't remember the name of the tool I use to test video RAM).