Crash then total blackout

May 27, 2018
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Hi,
Was on GW2 and PC just crashed, no warning beforehand just went down. Tried rebooting, but no response from anything. No fans, no lights, just completely dead. GPU was pretty hot so I've let it cool off and tried. Still nothing. Removed GPU and tried. Nothing. Inspected CPU and looks clean, same with the Motherboard. Now thinking power supply.

Please find specs below.

GTX Gigabyte 950 windforce
Intel i5 2400 processor
Thermaltake TR2 Challenger 500w PSU
16GB Corsair RAM
Gigabyte C1 B7 Sniper Motherboard
Toshiba SATA III HDD