MOLEX power connector burned + melted

When I came back home from work, I switched my computer on and I went downstairs for dinner..

When I went back to my bed room, I smelt something burning really bad and then I have notice on the screen it say "Asus Anti-Surge Protection" or something like that.. My computer has restarted automatically.

I had a quick look inside my PC... MOLEX power connector that connect to a DVD drive has been burned and melted... Possibly fire as well but not sure.

What is causing this?

I am using old PSU that I have been using for a long time:

CORSAIR HX 520W MODULAR PSU

my computer spec:

i7 4790k cpu.
Asus Z97-A motherboard.
8Gb ram
Samsung SSD.
Noctua CPU cooler.

what gpu u using?

pigeonguyuk said:

what gpu u using?

Click to expand...

Radeon HD 5670

I had a similar issue the other day but with a sata connection using an old corsair hx620w.

Turned PC on glad my side was open but soon as I turned it on it flamed up destroyed circuit board on the drive. Glad I had an old drive the same which was broke anyway I just replaced the board and everything works fine.

What caused it to happen I have no idea.