Monitor doesn't recognize computer.

[Luxe]

Alright, so the computer worked 100% until I went in the BIOS and applied a VERY minimal over clock from 2.8ghz to 3.3ghz. I increased the voltage from stock to 1.35v on my AMD X6 1055t. After that I rebooted my my monitor never recognized my computer again so I RMA'd the GPU, CPU & MOBO. I've tried new ram and a new PSU as well. Still getting "No signal" I have also tried a different monitor as well. I've also tried resetting the BIOS with jumpers like it said in the manual and removing the battery to reset the CMOS. I even used different RAM in different slots as well. I have done almost everything and need help.

Specs:
AMD 1055t
ATi 6870
8GB G.skill DDR3 1600
Biostar TA99FXE
Cougar 650w 80+ certified
1TB 7200rpm seagate

 

[gameridgoeshere]

Maybe something broke, do you have a second PC that you can test to see if all the parts are working? and were you overclocking on the default cooler? because those factors might have had something to do with it!

 

[Luxe]

Maybe something broke, do you have a second PC that you can test to see if all the parts are working? and were you overclocking on the default cooler? because those factors might have had something to do with it!

I tested everything on a second computer. I am using the stock cooler that came with the brand new processor.