YAY we have a winner
I was looking at you post and I have had the same thing happen to me once.
The problem was that my 4 pin power connector wasnt full in, so the mobo wasnt getting the proper power.
Check if its in fully
If that is not it than I have a feeling it is the mobo.
When a mobo is not working properly it will do this.
This happened to me when the PCB on my mobo blew.
It would sometimes POST and sometimes it would do nothing (only the fans turned on).
So I sent it back to newegg and they refunded me my money since the board was faulty.
If it was any of the other components than the mobo would be beeping at you.
I am sorry to give you this bad news, as I hate it when its the mobo since you have to take everything else.
If you want anymore info or help I would be glad to
EDIT: Sorry if this was already mentioned in your thread...As I did not read the entire thread. Also, just out of curiosity what is the min. requirements for your 7600GS?