My homebuild from a while back has cacked out and I'm trying to run down the issue. Specs as follows:
Mobo: Asus M2N-SLI Deluxe
CPU: AMD Athlon X2 BE-2300
RAM: 4 x 1 GB Corsair TWIN2X2048-6400C4
Video: 2 x NVIDIA GeForce 8600 GT OC 256MB
Ran for years without much in the way of issues. At first it was powering up and then dying as soon as the DVD drive power up noise came on. I would not get any beeps.
Soon after that, the power on button just wouldn't do anything. I could get it to try to boot by toggling the power switch on the PSU, but it would do the same thing.
I have tested the power button, and that is not the issue. I have also tried a known good PSU, and the results were the same. I have tried it without RAM in there, and I get one long beep and then it powers down again. Popped the RAM back in and was back to the original problem.
I recognize that it's more or less an ancient system at this stage, but I'm really trying to hang on for another year or so so I can save up the coin for a better rig.
How well is your CPU cooler seated? I'd take it off, clean everything thoroughly, and reseat the cooler with new thermal paste. This sounds similar to an issue I was having that turned out to be the CPU overheating very quickly.
Yes, I have tried putting the RAM in several different ways but no luck.
I was under the impression that the RAM wouldn't be at the root here since I would at least expect it to POST. I did have a RAM issue on this one a while back but it was only when it tried to load the OS that I would get the BSOD. Is this not the case?
As far as I can tell the CPU cooler is still seated. I'll have to grab some thermal paste and try. It wouldn't have taken any big impacts lately since it's just sitting by my desk...
Sounds like the PSU took a dump only other possibility would be motherboard. You can use a multimeter and check the voltage on the 24pin connector, shorting the appropriate pins with a paperclip to "jump-start" the PSU.
I dunno, don't give up on the MOBO yet. I think if you've had the thing since 2007 and haven't cleaned out the CPU heatsink or anything it could be a heating problem. Have you tried running Core Temp or some other monitor while it's running to see your temps? Have you noticed that the PC is unusually loud before it shuts off?
Could be totally wrong of course, just that this sounds a lot like what happened to me.