When I shut down my computer, a few seconds later, the computer boots itself back up from the dead; i have to switch off the power supply to prevent it from booting up.

Sometimes when i boot up manually, i get a loud SOUND coming from the power supply and the motherboard is beeping. It sounds like a wire stuck in a fan or a bad relay. Sometimes I get GPU error beeps from the motherboard when i boot up. I suspect the 550 watt power supply might be malfunctioning. I might be overloading the power supply.

6 7200rpm SATA hard DRIVES
2 optical IDE drives
1 floppy
RADEON x800 PCI express x16
TV tuner
Pentium D 830
Random raid controller from hard drives (not in use andy more)
foxconn 955X7AA server board

do you think 550 is ENOUGH?

I wanted to get an Antec because of it's iron clad reputation but I cant find anything over 550.

Right now im using a no name GearMax brand 550 power supply.

Is the problem related to the power supply?Have you tested the current with a meter? I sure wouldn't even consider a no name unit for that much equipment.What does someone do with 6 hard drives?i havent tested the current yet

but i have traced teh failure back to the power supply

everything else works fine

once i get the power supply to work functioning after rebooting several times, i can reboot using the reboot button and there is never a failure, this is because the powersupply is not turning off when i reboot using the button RATHER than shutting down through windows

(i use the 4 of the 6 hard drives in a RAID 5 configuration to give me 1.2 TB on one logical drive )
one of the other two is the system drive and the other is just by itselfJust a simple case of you get what you pay for. I am constantly amazed how people skimp a little on this very important component, sometimes jeopardizing the integrity of all the others.1.2 TB and more. So ..., let me guess. You do the entire federal government's payroll on your computer?i just got same problem before
and i found out the switch is the problem
check if it needs to changeno im still convinced its my power supply :-/

if it was the switch, i would get random shutdowns in windows because i have that button shutdown the machine
and also that would not explain the half bootupswhat power supplys would you guys recommend for this much hardware? :-?
it's standard ATXThis Antec right here:

http://www.newegg.com/Product/Product.asp?Item=N82E16817103931

$75 INCLUDING shipping. What's not to love about that? i burnt my old 480 that came with the case. you think 550 is enough for my hardware components?Here is a rough estimator:

http://journeysystems.com/power_supply_calculator.php