My computer has been shutting off randomly after playing games for about 30 minutes to an hour. Once it shuts off, pressing the power button wont turn it on unless i switch the psu off and on first. When i use prime 95 and valley benchmark my cpu gets to 63 degrees c and gpu gets around 70 degrees c. From what i've been reading, it looks like the psu is the problem but i'd like to know if there's a way to confirm that the psu is responsible for the random shutting down.
CPU: AMD FX-4320
Motherboard: Gigabyte GA-970A-UD3
GPU: Sapphire DUAL-X R9 280
Power Supply: Azza Alpha 700w PSAZ-700C12
HDD: Western Digital WD Blue WD10EALX 1TB 7200 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
Thanks in advance for any help at all!