<< they guy says use a screwdriver... no idea what he means by that... >>
The caps are charged on the top. just take a screwdriver, and toucch the screwdriver from the top of the cap to the power supply metal. It will discharge the cap. CAps can hold a charge almost forever if they are good quality. Well, maybe up to a week or so.
Check your Powersupply for height. I just checked my Sparkle supply ( a 200 watt I had laying around ) and the tallest part is not the caps. It is a LARGE transformer between the 2 heatsinks. I almost started cutting up the heatsinks when I thought to double check that it would fit. With that, it WILL NOT fit in a regular CD-Rom. By maybe 1/4". Darnit.
So, check first.