$1,200 PC randomly can't run games

Rebounds

Reputable
Dec 27, 2015
3
0
4,510
I bought the computer in May of 2015, I've never had a problem with it and I could run any game I wanted on Ultra quality with great FPS. A few days ago it went to trash and now I can't even run League of Legends over 40fps (uncapped it used to run at around 480). I've reset windows and I've checked multiple times for viruses and its still awful. Please help.
Specs:
Intel® Core™ i7-4790 Processor (4x 3.60GHz/8MB L3 Cache)
MSI Z97A-Gaming 7 -- 3x PCIe x16, 2x USB 3.1, 6x USB 3.0, 2x USB 2.0
8 GB [4 GB x2] DDR3-1600 Memory Module - G.Skill Ripjaws X
NVIDIA GeForce GTX 970 - 4GB
800 Watt - Standard 80 PLUS Bronze
Corsair Hydro Series H55 120mm Liquid CPU Cooler - Standard 120mm Fan
1 TB HARD DRIVE -- 32MB Cache, 7200 RPM, 6.0Gb/s - Single Drive
 

Rebounds

Reputable
Dec 27, 2015
3
0
4,510

hmm ok. I forgot to mention this problem actually happened 4 months ago and right before I shipped it off I plugged it back in one last time and it was perfectly fine for the next few months...
 

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