can any1 help? when i put my new 400w PSU in my compurter after a while it just turns off and wont turn back on so i change it over to a 150w PSU, it works fine and dosnt turn itself off so after a while if i put the 400w back in and it will work for a while but then turn itself of again and i wont turn back on why is this? i have a AMD 2.8, 1g ram, 3 hard drives and 1CD drive is it just a overheatin problem or just 2 much to handle, how can i fix this i alos have just got a radeon 9800 pro does this need a certain PSU to run or wil it blow anything to smaller?

Well have you checked your CPU temperature? Boot into bios. you should find an option such as PC HEALTH. Go there and watch the temperatures. Do not put that 150w PSU back in there. You risk overloading it. Do you have any powersaving options enabled in either bios or windows? Look in controlpanel>power options Give a man a fish and you feed him for a day. Teach him to fish and you feed him for life.

My thought is that the 400w is faulty and thermal tripping itself. Return it. Please post back within 24 hours or I will delete the post from my follow up list. Thanks.

i have checked the CPU temperature and its about 55c witch is ok, i will take the PSU back and get a new one but will my radeon 9800 be ok with a 400w PSU or will i need something bigger and will it be ok with 3 hard drives, 1 cd drive, AMD 2.8 and 1g ram ?

I would say 400w is sufficient. Please post back within 24 hours or I will delete the post from my follow up list. Thanks.

400 Watt is only sufficient if it has the amps distributed correctly over the various rails. The +12v rail amperage is critical, especially with all those drives plus a high end vid card that takes an extra 12v plug of it's own. The general recommendation is 18 amps or better. Here's a rough idea of what you need: motherboard = 0.5 amp CPU = 10 amps HDD = 2 amps each (x 3 drives) optical drives = 1 amp each cooling fans = 0.25 amp each 9800 pro = 7.5 amps I'm guessing you'd need at least 25 amps on the +12v to cover everything. Another thing to check is the weight of the unit. Generally, the heavier it is, the more heavy duty the components...so heavy = good, light = junk. http://www.firingsquad.com/guides/power_supply/default.asp Asus A7N8X-X 1800+ @8x210mhz 512mb PC3200 Ti4200/8X 128mb WDC 60GB

25 amps X 110 volts is 2750 watts. Are you speaking of milliamps. Please post back within 24 hours or I will delete the post from my follow up list. Thanks.