Computer help forum: Windows 7 PC shuts down. Won't wake up.

By the way, the processor is AMD Phenom II X4 805 quad core. 8 GB DDR2 system RAM.

This sounds like some pretty classic signs of bad caps (google it), maybe a bad PSU. If it's bad caps, you may as well look for another computer, because unless you have some kind of extended warranty on that thing, repairing it will likely cost more. And the fact that it's an Acer brand will just make things even more complicated since Acer never stocks warranty parts for anything. It's a Taiwanese company that uses the effective slave labor of China to make cheap computers. They buy enough materials to make X number of units, and then usually after about 6 months they run out, so they move on to a new model. You name a corner to cut, Acer probably cuts it and then about a half dozen more.

The good news regarding your situation is, it is almost certainly nothing to do with you connecting your TV to the computer. Considering the TV has its own power supply and has a maximum resolution of 1080p, which is fairly pedestrian compared to what even integrated chipsets can handle, the odds of it in some way stressing the video chip to the point of failure is unlikely.

One area of concern I see is the use of so-called fixit programs. These things are pretty much universally scams. Long gone are the days when Windows needed regular intervention on the part of the user to keep things going. Especially when it comes to the registry. You should stay as far away from that as you possibly can. There is so much misinformation floating around about the Windows registry you would think that Windows is a shattered pane of glass and the only thing holding all the pieces together is the Windows registry and a prayer. That is a very mistaken impression, and the Windows registry is simply not that important. However, if you use registry fixing/cleaning programs, it can cause problems. Not the problems you describe, but other problems.