I hope someone can help me with this one, because I am stunned.

I'm helping my father with a very strange problem. It all happened when his PC first turned off out of nowhere. Then when he tried to turn it back on, it would turn on, but there was no output to the monitor. Luckily it was time for me to COME home for spring break, and I could help him, but I was stumped.

Now I went on a goose chase changing out all the PARTS I could, after finding out that it was not the video card's problem either. He wanted to upgrade anyways so it was fine. I'm going to list all the NEW THINGS and then you will see why it makes no sense for this to not work.

1. Socket 754 Board (NEW)
2. AMD Athlon 64 3200+ (NEW)
3. 1024 MB DDR RAM (NEW)
4. 60 GB HDD (OLD)
5. 350W Power Supply (OLD)
6. GeForce MX 420 (very old, but same problem exists even when card is taken out)

There still is no feed to the monitor even if I switch the video output to the onboard video, where as I thought it was just a simple video card frying. I couldn't see the HDD or the power supply preventing the computer from outputting video, so I think it's not a video problem at all, because it seems like the hard drive isn't spinning, but even if they hard drive wouldn't work, it would still go to the BIOS on the motherboard. I've fixed a lot of problems, but this one is KILLER. Maybe it's just a really simple problem I don't know.

Any suggestions?
Thanks so muchSo the symptoms are "no video"? At all? Did you plug in the power to the monitor without plugging in the video cable to see if it has the "No Input" message? Meaning.. does the monitor work on it's own? And then if it does, you're saying that when you plug in the signal cable, it just goes blank?psuyes i forgot to mention that, just to eliminate the case of something being wrong with the monitor I plugged it up to another computer and it worked fine

and yes I get the no input message on the monitorHmm. that is strange.. You've replaced the mb, processor, memory, and attempted to run on the old onboard video... yet still no signal?

I would imagine if it were a psu going bad, it should still have enough juice for the onboard video...

Having tested the monitor on another system you've proven the monitor is good.. and having replaced the mb... you've ruled out the video subsystem, pins, and anything else associated with the board.. and the memory is sometimes a culprit.. but you said you replaced that... So.. dang.. I suggest you reset the bios, reseat everything putting in only the absolute necessary components.. ie. one stick of ram, the cpu, and mb... attach the monitor and see what you get. Let us know what works in the end... GL.no post --> psui've told my dad to go ahead and replace the psu and i'll let you all know what happens