ok here is what i have 6 fans 5x120 1x140 Ati 3870512mb amd64x2 2.4cpu Seagate sata 250mb drive now all of this is running off a Apevia 500watt power supply what im wondering is if the power supply is enough for everything i have in my tower?

When does it restart: After booting up, OS, during games? Does it continually reboot afterwards? Also is it reproducable on purpose?

it was restarting during games till i installed the saphire drivers instead of the ati drivers for my vid card then it has only restarted once since then on it's own and it was during a dvd burn, and no it dosnt continue to restarting all parts are only 4months old its a newly built tower and the mobo btw is a asus M3A78-EMH HDMI.

As a stab in the dark I would have to say to test your memory out. This happened on my previous computer and only when playing WoW and only very randomly. The be program I've ever used was the Microsoft "Windows Memory Diagnostic" program.
http://oca.microsoft.com/en/windiag.asp
It was the only program out of the ones I used that found the error. Basically it makes an image on a floppy disk or .iso for a CD/DVD. Pop it in during boot and it'll run. Pretty simple and it will find issues. If you have more than 4GB of ram it will not be able to search as it is just a 32 bit program, but I'm probably the only person around locally to be that stupid (and I only use 32 bit XP haha).

I only have a 430W PSU in my gaming box.

I've never used that particular mem testing program. (Memtest 386+ for me ). How long does it take to do a single pass?

OK ran mem test and no problems there all passes passed.

OK so the passing passes pass passfully. Are temps an issue?

More than enough fans. What memory are you using?

try unplugging about half those fans, sounds and looks like a strain on the 12v rail.....

SuperTalent T8UX2GC5 DDR2-800 CL5 4gigs (4x1gig sticks)

even if i have only 3 to each line and if thats so im guessing i should get a higher power supply 600watt or up? its a cooler master cm690 case im guessing 4 fans would be enough two in front and two on the top?

do you even need anything but an exhaust fan? what are your temps with just an exhaust fan...fans doesnt mean performance, with good cable managment, and proper airflow, you could easily due with just 2 fans, and also, using every plug on one cable will cause your psu to act up..(happened in my old computer) i was pushing the limit of the PSU and had to spread the power draw over all the rails evenly to get it to even boot properly...another thing wattage means squat in this day and age, what are the rated amps (the pushing power on the rails) thats the important thing. just a look at your specs i would say a 20a 12v is a definate and a strong 5a as well...

I'd try running just 2 sticks.

Ok only running 4 fans now two intake to exhaust hopefully ill never have a restart problem again. last time it restarted btw was sat hasn't since and now hopefully never again. thanks for all the input guys