The "hard" way 'round isn't all that difficult either. I have a CQ62 that used to be my wife's (we bought matching notebooks... sweet, huh?) and when she "retired" it, I used it as an OS installation mule (Linux, Server '12, etc.) Recently, My 6 year old daughter was complaining that the Barbie website was stuttering and slow on the computer I had her on. I gotta wonder whether Barbie has a backroom deal with the computer manufacturers to sell more new systems, but I digress... You can still download a Win7 iso, or buy an installation media disk for a few bucks, and using the CoA on the bottom of the computer, have a nice, fresh install without any bloatware. Either plug it in via ethernet cable, or download the wireless driver on another machine and thumbdrive it over to the Compaq, and you can start downloading updates and drivers that way. It takes a bit longer and a little more work, but I'm pleased with the performance of the v120 on 3GB of RAM with the clean installation.
I got my late Mom-in-Law's "e" computer with a startup issue. The caps are fine, and my Linux live disks are working in it fine. The Ultimate Bootdisk mentioned above would have the same effect, with the advantage of having the diagnostic tools readily available.
Has the processor ever been pulled? If the thermal paste wasn't completely cleaned off and replaced, it won't have good contact with the heat sink. The reason I mention this is that I had a friend with the same problem, who never mentioned that he'd pulled the processor (as an exercise in curiosity) and replaced it. He didn't want to admit it, but once we got everything cleaned up and re-installed properly, it worked fine.
Another possible solution is to lightly dip a properly sized screwdriver in lapping compound. We've used this to replace stripped screws on aircraft quite a lot. Just be careful not to make a mess... it only takes a dab. If that doesn't work, then we'd bring out the Dremel.
The Rebel X and Xs film camera uses CR123 batteries. You can usually find them at drugstores with a photography section, or at Walmart. There may be some confusion if you ask someone at the counter (or online, for that matter), as they may not be familiar with the non-dSLR version of the camera.