I'd say 300watts is fine for all that. What are the actually STOP codes from your crashes? When do they happen? Need more innnput

They are pretty random, doesn't seem to happen in any particular pattern. Sometimes it just crashes while I'm working on it, then sometimes its after I first start to use it after being on all night.
 
The stop codes are IRQ_NOT_LESS_THAN..., PAGE_IN_NONPAGED_AREA, and most of the time there is no specific error code, or driver mentioned. Within XP, I get some software that just crashes with memory read errors.
 
I have had the memory tested and even tested it myself with a diagnostic tool and it did not find any errors. The temp of the system has gone up to 40C-MB, 41.5C-CPU, not sure if that could be a problem too?
 
I've been battling this for about 1 month now and still have not found the primary culprit. It started to happen about 1 1/2 months ago after a power outage, and since then I've replaced the MB/CPU/Memory and have gotten a new vid card. I haven't replaced the sound card or network card, but I guess those could be next?
 
Thanks again for any help in solving this...

Thats memory bro....
 
Try a new stick

Well I have 2 -256 MB sticks, could it be both or just one, what's a good way to get it tested?
 
Thanks!

I thought you said that you had tested it... hmm.
 
Try MemTest86.

Downloaded and tested with that program and it reports no errors on the standard 7 tests it runs. Does anyone else have any other ideas on what might be happening here?
 
Thanks!

Maybe the RAM settings in your BIOS are set to Turbo or something faster so that the RAM can't handle it, if this is the case, try setting the Asus board to set RAM timings automatically or use more conservative settings.

I checked out the settings and they were the default, but to be safe, I moved them up to the most conservative settings. I also removed the stick of memory from slot 2 (this MB only has 2 slots) and I have not experienced a crash yet. Is there anyway to tell if it's the stick that is bad or possibly the slot on the MB? The memory is "supposed" to be Micron, but on the chip I took out, it's labeled Samsung; also both sticks are single sided DIMMs, does that make a difference or not as to why having 2 sticks might have been causing crashes?
 
Thanks for all the advice and help today!

If it's Micron memory, I've heard they occasionally use Samsung if it's cheap enough for them to use or something like that. Samsung is very good, make no mistake. My thinking is that one stick might not be rated for the same speed as the other--even though it may have been marked as a certain speeed, it might have been accidentally mis marked as the higher speed. It happens.
 
Try the Samsung stick by itself in the same slot as the Micron and see if it causes problems. If that checks out try the Micron in the slot you originally had that Samsung and see if everything checks out. Process of elimination.