Hi guys, i think i've somehow got myself a weird problem with the power supply of my PC.

I recently bought a used Antec TruePower 480W to replace the Enlight 420W on one of my PCs.

The specs is as following:

- Pentium 4 Northwood 2.8C HT running stock speed
- Abit IC7 non-G
- 4x 256MB DDR400 RAM
- 128MB GF4Ti4200 8x graphics card
- 1x HDD
- 1x FDD
- 1x optical drive (DVD-RAM in case it matters)
- 2x 12cm fans

Guess that's all i guess.

Well... i bought this new Antec to replace the old Enlight due to the fact the old Enlight seemed to be running fine except 1 thing, which is a pretty low +12v voltage reading, lingers around 11.5V which i think isn't too good a thing, that is with the unit running Folding@Home most of the time and it's the average reading from Motherboard Monitor. So i bought the used Antec thinking that well... it have a much stronger +12v rail, rated at 28A compared to 18A of the Enlight.

Ok.. long story short, i brought back the Antec, removed the Enlight, and plugged in the Antec. The PC started fine, fans running, lights on, but it just doens't boot into BIOS! Unplug everything, plug in the Enlight, and it works like a charm except the low 12V rating. I tried the Enermax FMAII 460W from my C2D PC, and it's the same thing, PC started fine but doesn't boot thru BIOS, everything just running and no booting.

Anyone knows what's the weird problem with this PSU + motherboard combo?

I've tried the Antec on another KT133A equpped PC and it also doesn't boot the PC, same problem as the above set. So is it a PSU problem or a motherboard problem?

Hope to get help on this ASAP as the seller is only giving me a week of warranty to try out. Thanks!

Have took some time to try plugging the Antec TP480W into my Pentium Dual Core rig, turns out it doesn't boot as well and the Enermax FMAII 460W that's paired in that PDC rig works fine.

Guess i can rule that the Antec is faulty?

Funnily though, the Enermax FMAII just doesn't run in the P4 rig of mine, had got it replaced with an older Enermax 430W and it runs fine, but still giving a somewhat low +12v rail at 11.74v average under load from Folding@Home.