Computer suddenly not detecting GPU after 5 months

[ziggi]

Hi!
I built my computer this April and it's worked phenomenally... until now. Basically, last week, my computer crashed while I was playing a game. (Heroes of the Storm, to be exact.) When I turned it back on, all of the graphics settings when I opened up any game were automatically set to low. It took me a little bit to find out that my graphics card (MSI Radeon R9 280) was missing from my device manager.
I used this thread to fix it, and it worked the first time and all was fine. At least for 4 days. 4 days later, the same problem came up again, and I used the first two solutions described in that thread, but to no avail. I uninstalled the graphics card from device manager as described in the second solution and haven't been able to reinstall it at all. It's just not getting detected, and I can't figure out why.
Does anyone know how to possibly solve this? Thanks a lot!

 

[hang-the-9]

Test the card in another system with the power to run it, if it works there, try another power supply with your computer and that card. Will help narrow down where the issue is.

 

[ziggi]

Test the card in another system with the power to run it, if it works there, try another power supply with your computer and that card. Will help narrow down where the issue is.

First, how do you un-pick an answer as a solution? I accidentally clicked the button there. I don't have a second computer that I can transfer the card to. One thing I forgot to mention in the original post was that the error was "Code 35". I'll try to physically unplug an re-plug in the card this weekend and post if it solves the problem.