Pc will not go into post

[matt15355]

This started when I tried installing a new GPU (I have a different power supply that I use from the original). I had no problem installing it but I could not go into to post. 

List of things I've tried 

-unplugging everything except for important pwr cables (including removing gpu entirely)

- resetting and removing cmos

-switching power supplies 

-switching power switches

-taking ram out to see if there are beeps (used put the original speaker that came with the product; don't know if it works for error beeps)

-used only dimm slot 1 from boot

-took the motherboard out of the case now making sure no cables are grounded

-screwdriver test with power switch

The green light is still solid on the motherboard. when trying to boot no fans spin nothing happens almost like I hadn't even pressed the switch. I noticed if I have the cpupwr and the pwrcwm in the psu and cpu fans spin but plugging in the pwr stops it. 

Help would be appreciated because I've run out of ideas and I think I killed my mobo. 

Thanks in advance. 

[itsmyname]

Try a different power-supply, after connecting your monitor to the integrated video-out socket.

Try a different power-supply, after connecting the GPU to the motherboard, and connecting your monitor to the GPU's video-out. 

Try connecting the GPU to a different computer's motherboard, to prove that it works.

>  I think I killed my mobo. 

I agree.  But, you may have killed the CPU.

Does your motherboard have a "clear CMOS" jumper? If so, use the jumper to return the motherboard to all its "default" settings.