If it's not the power options then it could be a lot of things...
Can you give some more details:
When does this happens and what you are doing when this happens? (is it after 8 hours of gaming, or 10 minutes of youtube, or after you leave the computer idle for 5 hours, etc)
When did the problem start occurring? (since you got the computer a year ago, or last week after you lost power, or after a software or driver update, etc)
It's not the power options. All my devices turn off including my monitor and I can't turn them back on. I try taking them out and plugging them back in but nothing works. I eventually get sick of it and have to restart my computer. I've also noticed after this happens I can't restart my computer right away. I have to wait at least 10 minutes or so which makes me think it's overheating but I'm not sure how to fix it. I guess I could take off the plate and have a fan blow into it.
Yeah, but the thing is that it manages to work for a while. I got it to work perfectly for like two, three days but now it won't even boot. The monitor and devices just won't turn on. But watch in another couple of days it'll start working perfectly again. It's like it chooses when it wants to work.
Failing components don't always just grind to halt and stay broken. From your description I wouldn't suspect overheating (otherwise it would fail and recover more predictably).
My advice is to consider a new PC, simply because the issue may be hard to isolate to one component and so may lead to you spending more than the PC is worth if the motherboard doesn't fix it. If you want to fix this one I'd start with the motherboard, however it really could be your PSU or possibly even the CPU.
You can do some testing with a multimeter to check the voltage levels from your PSU, and try running Prime95 and Memtest86 to check your CPU and memory.
I really hope it's not the motherboard. Cuz I really don't have the money to buy a new computer. This one costed $800 dollars and it's been doing this off and on since I got it last year. Will HP fix it for me? If so, how much do they usually charge?