It's not a PSU issue, it's a motherboard behavior. Your PSU is FINE!
Most of the time it's related to memory settings. On cold boots, the motherboard does a RAM TRAINING test. It tries the XMP or JEDEC with optimal settings, no skews, no sizzling bits, no nothing. It then adjusts all the subtimings and subsettings and when it's satisfied it does a semi-warm boot. Shuts down and starts up again with the RAM settings locked. This is happening before POST information is displayed on the screen.
It does this because RAM has a strange behavior over time (a type of degradation) and it needs to relax some obscure settings. When the computer cold boots, it will do a NORMAL boot sequence instead of the QUICK boot sequence and this means retesting the RAM.
Before you ask, NO, this does not mean your RAM is defective. It's just something BIOSes had implemented a few years ago. Some boards will adjust these obscure settings, some will not.
sebby490 reacted to Sihastru in Computer turns on, off, then back on
