It could be anything. The motherboard. The BIOS. The GPU. The RAM. The PSU. Are you even able to watch the system POST or does that not even display? Do you get any diagnostic beeps? If so, look them up in your board's manual. Also, have you updated all the firmware for your board?
The first thing you need to do is run memtest86+ for as long as possible. I'd say give it a full 24hrs worth of test passes. If the memory (either the ram modules themselves or your board's DIMM banks) are bad, you'll surely encounter errors within that time. Maybe on the first past or maybe on the twentieth.
If that checks out fine, the next thing I'd consider is wiping your install and doing a fresh install of your OS and card drivers. If the problem still happens after that, find another card that you can test or put the card in another machine and see if the same problem occurs while running some burn-in/benchmarking GPU tests. Doing this with another PSU would also be worth testing.
Also check that you don't have any loose cables and that everything is seated properly and not potentially shorting out.
Before you can start to RMA things, you really need to begin the process of vetting each component and eliminating them as possible causes. Chances are that, based on those descriptions, your video card vendor will suggest that it's a possible memory or PSU issue, so at least running memtest will help you with one or two elements.
I can't see anything when the computer is powered on currently and there are no beeps, everything seems to power up fine, I just get absolutely no output. That's whats leading me to believe it has to be a straight up GPU problem because it'd have to be something severely wrong to get absolutely nothing from powering up the computer, and yet I can go from getting absolutely nothing on the screen to the computer working fine for weeks at a time before locking up again. However, I've tried about 10-15 times to boot the computer and it's still just a black screen, so I can't really do any memory testing but I have another video card to try in the computer in a few days, which should help narrow down my suspicions. If that doesn't boot the computer up right, I guess I'll have to look into a PSU.
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