Interesting Power Issue

[gauchotodd]

So I pieced together a build a few months back mostly from a system we thought was dead, got it up and running Ubuntu, but it was making two beeps on startup - first beep, pause for POST, second beep. I didn't see any error messages, and it seemed fine until a couple months later it wouldn't start up at all, so I replaced the PSU (which was old and overused anyway) with another used one and it started working again just the same, two beeps but no other issues or warnings.
I just built a separate system and as a result didn't turn that old one on for a couple weeks, and when I pushed power it powered up the fans, hard drives, and optical drive, but showed no display, and gave no beeps. Tried all kinds of troubleshooting tips, pulled pretty much all connections with cables and graphics card, CMOS battery, took a can of air to it, etc. CPU fan starts, case fan and light turn on, optical drive blinks, hard drives make their noises, but no display and no beeps anymore. I don't have another GPU or PSU to try; any ideas where to take it from here? My opinion is it is probably the PSU since it seems really old, I just don't know how to explain it being able to give power to everything but not enough to have it POST. So it could also be the MBoard, I suppose...

 

[gauchotodd]

To give a bit more info: it's an Intel motherboard with an 1156 socket i5, had 4 sticks of 2GB 1333MHz RAM, but they were two different manufacturers so I pulled the two cheap ones and left the two sticks of Corsair, and it's a Sparkle NVidia 220 GPU. I've also pulled the GPU and tried onboard DVI, same result.

 

[gauchotodd]

Ahhh I finally figured it out. I switched the Corsair RAM out for the crap RAM and it booted right up. Must've gone bad. Hopefully this helps someone else experiencing a RAM issue...