Please help me

[Alfheim tales]

Problem: Monitor, keyboard, mouse won't work
Motherboard: Asus M5A97 R2.0
CPU: AMD phenom x4 965
GPU Sapphire Radeon 7750
RAM: Kingston D1G72K111 8GB 1X8GB DDR3 1600MHz
Power supply: CoolerMaster 500W PSU Extreme Power
When I did MemOk, it keeps flashing red, help would be appreciated.

 

[AMD Radeon]

becareful of your PSU...

i have read too much thread complaining about CoolerMaster PSU Extreme Power

 

[Alfheim tales]

becareful of your PSU...

i have read too much thread complaining about CoolerMaster PSU Extreme Power

No it's not the PSU, I tested another PSU that worked with another desktop but wouldn't work with this one.

 

[AMD Radeon]

bad psu has very high chance to damage another component, permanently

 

[Alfheim tales]

bad psu has very high chance to damage another component, permanently

I'll try replacing the psu then, thanks.

 

[Alfheim tales]

bad psu has very high chance to damage another component, permanently

Nope it's not the psu, I tried replacing it and nothing, the mobo gets a green light, cpu and gpu fans are working, idk what the problem is -.-

 

[AMD Radeon]

bad psu has very high chance to damage another component, permanently

Nope it's not the psu, I tried replacing it and nothing, the mobo gets a green light, cpu and gpu fans are working, idk what the problem is -.-

as i said, bad psu has very high chance to damage another component, permanently
and you are too late

use this step by step troubleshooting to identify damaged component
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems