lammert - 3:01 am on Jun 23, 2010 (gmt 0)
... because I would have to wait about 10 minutes or so after plugging it back in for it to regain enough juice to to start up.
Doesn't sound like a capacitor problem to me. Dryed out capacitors have less capacity and charge faster than good ones. This sounds more like a crack in one of the prints--maybe the motherboard--where a print lane is interrupted but connects again if the system heats up.
In any case, 10 years is a respectable age for a computer and as it is your primary development system it may be a good time to upgrade, or at least replace the vital components like motherboard (including CPU+RAM) and disks.