I don't understand what you're trying to do. If you're getting video output/a flashing disk icon/chime, that suggests you do NOT need to replace the capacitors, but undertake normal troubleshooting routines to try to get the machine to boot. Same goes with the power supply - the Mac appears to work, you don't need to pull it apart.

Why put your precious Mac at risk of complete failure when simple troubleshooting may be all that you need? And lastly - don't put things in the oven for a little while to dry them, that's kind of crazy.

JB