So my mothers computer one day decided to fail. The problem is when powered on the machine gives no display. There is no beep code to clue me in on a possible issue. It does not display the option to bring up the BIOS. The video adapter she was using is an on board unit.

Things I have tried in my troubleshooting efforts are as follows.

I tried replacing the psu with a known working unit to no avail.

I tried using another known working monitor which also didn't work.

I replaced the VGA cable, no cookie.

I tested the original monitor with another computer, the monitor works fine.

I tried using a DVI cable which also did not work.

I also tried to instal a new video card which also did not solve the problem.

I have run out of ideas and would love some expert advice. Thank you in advance for your time.

I just tested the ram in another computer seems fine. I also tried to replace the cmos battery. Somehow I overlooked the fact that the keyboard lights stay off when power on the computer. Which would lead me to think that you are correct and the mother board has died.