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[QUOTE="jwhiz, post: 11902053, member: 6219"] Hi, I bought an old 'mystery machine' PC a few months ago, and while it functions well, the fan in the 300 W PSU seems to be failing (makes a racket when starting after at least 20 minutes off, then fades after about 10 minutes to a dull roar. When you prod the case of the PSU, the fan pitch changes). I have another 300 W PSU, so for a change I'd thought I'd ask questions, and THEN 'experiment': #1 - what are compatibility issues? PSU now in box is a Powerlink LPT2-20 300 W ATX, with 22A on 3.3V, 30 A on +5 V and 14A on+12 V (also 0.3 on -5 and 0.8 on -12). The mobo connector is a 20 pin (i have contacted the mobo maker of this...thing, a K7SOM+, and their helpful resonse was that "most power supplies over 350 W should work". Uh huh.) The PSU I was wondering about swapping in is from an older PC with a dud mobo, as far as I remember the PSU was fine, here are it's specs: Star Tek (really ) AP-350X 300 W, with 20 and 4 pin mobo connectors, with 28A on 3.3, 30A on +5, and 15A on +12 (same -5/-12). Is the loose 4-pin connector an issue? what about the differing amperages on the rails, should I be happy for more power or is overpushing a concern? #2 - how might I test the 2nd PSU without hooking it all up? I have been mooching around the internet for a few days, I have some idea of which makers to avoid if I end up buying a new unit. I plugged in some figures to an online wattage calculator, and, wow, it suggested 280W requirements...As this is a 'second' computer, I don't want to put a gob on my credit card, but i don't want to put a dud PSU in it either - I know you are in the UK, and I'm in the Dominion, but any ideas for 300W or 350W units in the sub-$100 CD range would be appreciated! Some specs on the PC are: mobo as noted some kind of AMD-type CPU, 1.3GHz (I can't see a label, and box isn't running at moment!) NVidia GeForce FX5200 (PCI) instead of onboard video (added) onboard sound 1 GB DDR RAM (has heat spreader, max. supported)(added) 1 extra case fan (ball bearing)(added) Maxtor 30 GB HD, Western Digital 40 GB HD (added) onboard NIC Win XP Pro, SP2 (on 30GB), Win 98SE (and soon, Linux) on 40 GB (I just added WD HD, it's newish from another old PC, OS only and no files, want to try running internet through that instead of Windows) My #1 computer is an Apple PowerBook G4, my other #2 PC is an ancient (but functional) Dell desktop. O yeah, and the Palm Tungsten E2...and those other things are just PC component storehouses... [/QUOTE]