Random Black Screens?

[Ponzooon]

Every so often when I'm doing something the screen will go black sound will keep playing in the background for a few seconds before turning to a buzz.
Often Windows will also just boot to a black screen or as soon as I hit enter after I type in my Windows password, Boom! Black screen!

I've tried reinstalling graphics drivers for my R9 290 card.
I've tried running a disk check.
I've tried a system restore.
I've tried reinstalling Windows 10 after formatting the hard drive.
I've tried booting from my cloned backup hard drive.
I've tried unplugging my graphics card and using the Integrated graphics.
I've tried the Windows 10 system repair thing.
I've contacted Microsoft and let them take control of my PC and they just did the same system repair thing that I'd told them I had already tried.
I've tried a new monitor and cables too.

It actually went to black screen halfway through typing this.

Nothing makes the slightest bit of difference.
Can anyone help? Is it a busted motherboard? Faulty PSU? Dying CPU?

 

[Colif]

can you post your specs so we can work out whats wrong?

It doesn't sound like a windows problem, as you not getting any errors.

Letting Microsoft run pc, thats desperation right there

 

[Ponzooon]

Intel i5-2500k
8GB DDR3 1333 MHz Corsair Vengeance RAM
Sapphire R9 290 OC Tri-X Graphics Card
The system summary said "Baseboard Model Not available" so I'm not sure of the MB.
Pentium P4 550W PSU
250 GB Crucial SSD and 1 TB WD 7200RPM HDD

 

[Colif]

Motherboard is sort of important, might want to open case and see if its got any codes or a name on it.

brand and model of psu might help too.

only as you suspect them and after all your testing, not a lot left.

it sounds like it just runs out of juice, gives up on screen and slowly dies.

 

[Ponzooon]

Asus P8Z77-V LX I think is the MB model
Pentium p4 PC550AUBA-B is the PSU model
It doesn't die slowly, this seems to die instantly.

 

[Colif]

its probably the power. This is the one you have: http://www.cclonline.com/product/42157/PC-550AUBA-M/Power-Supplies/Powercool-550W-High-Efficiency-Modular-Power-Supply/PSU1187/

The company name isn't on this list but then its an older computer so it would be asking a bit much for it, but nothing from the brand name is a worry: http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

they weren't recommended here 4 years ago either: http://www.tomshardware.com/forum/323150-28-good-ebay-link-powercool-750w-modular-plus

I would buy a better psu from a known brand and most of your problems will go away