Loud bang and flashes

[tom1234567]

I have just been upgrading my pc and decided to run a benchmark test to see if everything is working the way it should. About half way through the test my GPU was performing at 99% then 3 bright flashes appeared followed by what sounded like a fire cracker when off in my case. I don't know what caused this but I'm hoping it was just the case of a PSU giving in.
My specs are
750w PSU
R9 280x GPU
I5 4460 CPU
16 GB ddr3 RAM

Thanks really need a solution

 

[Puff3r]

Start by removing all components from the tower. Visually inspect each one for and signs of discoloration or black marks or burst capacitors. While there smell each one for the scent of burnt silicone. If all looks and smells good, try replacing the power supply first. Reconnect only the fans, motherboard, and processor. Attempt to boot. If all progresses add RAM. Again test. Keep adding components back one at a time to test.

 

[tom1234567]

Start by removing all components from the tower. Visually inspect each one for and signs of discoloration or black marks or burst capacitors. While there smell each one for the scent of burnt silicone. If all looks and smells good, try replacing the power supply first. Reconnect only the fans, motherboard, and processor. Attempt to boot. If all progresses add RAM. Again test. Keep adding components back one at a time to test.

It doesn't even switch back on though

 

[jimmysmitty]

It does sound like the PSU went. What model is it?

 

[sizzling]

Yeah that's typical major failure of a PSU. What make and model was it, hope it was a decent unit as that would mean it should have had good protection for your system. If its a low quality unit such a spectacular failure is likely to mean an expensive fix