Well not exactly but from 2010 to now I'd just pop in a new CMOS battery to start. Some folk push back on the simplest thing it could be but it's where I'd start.
I have an old HP Pavilion all-in-one PC, model MS235 that I have been messing around with for a week or so now. It runs Windows 7 and features an AMD Athlon II processor. When I first got the setup and plugged it all in, the PC booted up fine. It took quite a while, but it made it. However, once I shut the system down and tried to power it back up again, I got no display whatsoever. On top of this, the hard drive and CPU fan seem to be starting up for a few seconds and the back off again, alternating each other. I have the system tore down (which was a process all in itself), and I have tried a few things already.
Things I have tried:
-Re seating the RAM
-Switching RAM around and taking a stick out to check for bad RAM.
-Re seating the plug for the power switch
-Resetting the BIOS via the motherboard
-Checking the hard drive on another PC to make sure it's good (it is).
-The led on the front next to the power button does NOT turn off or change color, it stays a solid blue during the entire process.
-The screen doesn't appear to be turning on at all. It's not just a black screen, it's off.
-I removed the RAM and tried to start the system. I wanted to hear if I got a beep-code, and I did. That tells me the motherboard is likely not the culprit.
The only thing I can think of is there must be a short somewhere, but I haven't got a clue where. If anyone has any ideas, I'd be grateful.
I almost forgot, though I don't know it matters, but the motherboard has the model number DAOZN1MB6Z0.