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I got my PC back from a shop a few days ago. It was working great up until today, I went to start it up this morning and it froze at the enter bios screen. I press F2, I press del and nothing happens. It’s been sitting there for a few hours and it seems as if nothing is registering. What do I do?

CPU:AMD Processor FM2 TRINITY A6 5400K 3.8GHz MOBO:MSI A78M-E35 FM2+/FM2 GPU:GTX 650 Ti 1G DDR5 RAM: 4GB DDR3 PSU:Corsair Power Supply VS Series 550W Could this system run most games on 1920x1080p on medium settings?