No output to HDMI (but ok to VGA...) after CPU upgrade

Hi there,
I have a very strange problem... hope you can help!
I wanted to upgrade my Mac Mini to use it as an HTPC, so I passed from 1.83Ghz CoreDuo/512Mb to 2.00Ghz Core2Duo/2Gb.
The CPU and RAM upgrade process went OK, so I tried to connect the Mini to my HDTV (TOSHIBA 37A3030D) via a DVI->HDMI cable, but the screen was blank.
I thought I had somehow damaged the digital video out of the Mini during the upgrade, so I tried to plug a 17" monitor with a VGA-VGA cable and a DVI-VGA adapter: no problem there.
Then I thought about a cable issue, but the very same cable works perfectly when I try it with my MacBook Pro, and in the same TV.
So I played a little with SwitchResX and finally resolved: after few tries and some reboots everything worked.
But then I noticed that CPU temperature was a little too high, so I decided to re-open my Mini and put a better thermal compound.
All went well, or so it seemed: in fact since this last intervention the CPU temperature went ok but I couldn't get HDMI output from my Mini any more!!
Output to VGA still works, tried with the monitor I mentioned before and with my TV's VGA input ... too bad I can't reach 1080i via VGA!.
I tried almost everything:
- Playing around with SwitchResX, with no luck this time...
- Resetting PRAM and NVRAM with various methods (the little button on the motherboard, CMD-OPT-P-RE during the boot, etc... )
- Resetting SMC
- Resetting firmware (keeping the power button pressed when turning on the machine 'till it beeps)
- Reinstalling Leopard
...no results.
The weird thing is that if I VNC to the mini I notice that the TV is correctly recognized (screenshot: http://www.matteo.ge.it/vnc_mini.jpg), and EDID data seems ok (link: http://www.matteo.ge.it/TOSHIBA-TV_macmini.txt)
Do you guys have any idea?
Thank you so much, I'm getting desperate

I tried to connect the mini to the TV just after the upgrade. After some tweaking with SwitchResX it worked. The problems began when i decided to re-open the mini to put some better termal compound over the CPU.
I agree with you, I have probably screwed up something during this operation, but I really can't say what!!! I tried both TechToolPro and the hardware tests from Tiger DVD, and all of the tests were ok...
I phoned to the Apple tech support here in italy, but they proposed me to change the entire logic board, which would cost me almost the price of a brand new machine!!
The ultimate test I want to do is to hook up my Mini to a DVI monitor with a DVI-D cable.
If it doesn't work, It is almost certain that I have damaged digital video out (even if I would like to know how I could did that!!)

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