I am running a P4 3.0GHz, Asus P4C800E, SCSI CD Rom, IDE DVD Rom, SCSI CDRW, IDE DVD 8x Writer, Radeon 9800Pro, 2 x 36GB Raptors in RAID 0, 1 x 200GB SATA Maxtor Plus, Floppy Drive, 4 x 80mm Case Fans, 4 x Peripherals (Printer, Bluetooth KB/Mouse, Joystick & PDA) attached to 4 x USB ports, TBSC Sound Card, Adaptec SCSI Controller and and ISDN modem and started to get problems with my PC not starting up all of the time it was pretty hit and miss. These were all being supplied power by an Enermax 365 watt PSU.
I just changed the PSU to a new Zalman ZM400A-APF (400 watt) and the problem has gone away. Hope that gives you some indication.
