Can this confirm that my CPU is faulty?

[Charlenator]

Motherboard: MSI H77MA-G43 1155 socket.
Alternative motherboard: ASUS H61M-K 155 socket
CPU: intel core i3 3220 3.3ghz dual core.
PSU: Intex AC 230v
Alternative PSU: older. 400 watt. ~220v - 240v.
GPU: Nvidia geforce gt240 ddr3.
RAM: Apacer 4gb UNB PC3- 10600 CL9 (not sure what specs to give)

A week ago I made a wall mount for my pc. In the weeks leading up to the mount going up my components were just scattered across a table (everything plugged in and working, just not mounted on anything).

I mounted everything on the wooden mount (4mm steel screws through the motherboard holes, with small nuts under the board to lift it from the wood)(the screw went through the board, then through a nut, then into the wood and fastend with another nut in the back).

When I tried to switch the pc on, it started power cycling without booting or displaying anything on the screen. I unplugged each component one by one to determine what was wrong. I also tried another PSU. Eventually only the ram was plugged in (by this time I had the screen connected to the on-board vga port). It still did the same. Without RAM or the CPU, but a cpu fan, It does not power cycle. It also does not beep for a ram error without a cpu though.

Before I realized it does not cycle without a cpu, I got a new cheaper MB online, an ASUS H61M-K. With the CPU in this MB it does not power cycle, but I still don't get any output to my screen via either the graphics card or onboard vga port. My gaming keyboard also does not light up.

Any Ideas what else I can test? Or can I assume the cpu is broken and buy a new one?

 

[CountMike]

Try dismounted again and I would use plastic spacers instead of nuts. Also MB screws are 3mm. Screw heads and nuts may be touching some other parts of the board.