P965 Platinium won't start up after CPU change and swap back - HELP Please

Hi all,
I have a P965 Platinium which has been working perfectly.  I decided to try upgrading the CPU and put in an E5700 (socket 775 CPU) which I now realize is not supported.  So I removed it again and re-installed the original CPU but now it won't boot - fans come on, HDD and DVD power up, but the Video goes into sleep mode.
Any thoughts ?  This mobo doesn't appear to have any sound / beeper or at least, there's no beeps coming from anywhere.
Do I maybe need to clear some condition which was generated after the invalid CPU was tried ?

No joy :(
There is a beeper connected to the mobo and there isn't a sound out of it at all so I'm completely confused right now.
The CPU and Graphics Card fans are all firing up OK and the CPU gets hot confirming too that it's also getting power.  I tried the modo with the CPU and no heatsink and the system shut itself down which was obviously to protect itself so again it seems to me that the syste is still alive.  I also tried another graphics card but also no joy.

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