Lee Davison wrote: If wired per the reference in the PDF... for testing with no devices attached (will prob need a dummy load for 5V I'd imagine) to see if the part is what is causing the voltage to drop to 8.5V. Not to actually use. This is also a small part... wouldn't it be dissipating a large amount of current clamping the rail from 12+V to 8.5V ? How would it survive ? There are no heatsinks/etc ... I'd imagine this is to eliminate overvoltage situtations ? Good to know I have an ESR meter. Have you ever seen a cap 'leak' oil ? This looks like a film of light machine oil. And the caps have none on them... the part with the most on it is the C1093... but I've never seen a semiconductor device leak 'oil' ? The only other component with a lot of this 'oil' on it is the 12V adj pot. Doubt this 'oil' got there by human intervention.... as it is on the inside end of the power supply (you need to take apart the computer and almost take the power supply out to really get to this end of the supply. Guess I'll have to plan on pulling the caps to see if they could be the source of the leak.... but if so... I'd imagine they should have a film on them too, no ? And of course they have that white 'glue' between them (more like a hard caulk than glue I guess ?).... what is that for anyway ? Thanks for the reply.... I'm hopefully it won't be too hard a fix. Guess the toughest will be if the 'oil' contaminated the 12V adj pot... in which case hopefully it won't be too hard to get the same pot to replace it with. -- Curt