You might need to troubleshoot, changing one element at a time. My suggested order:
- Cables (which you've already dealt with.)
- TV settings. I find them to at times be tough to navigate.
- Ports. Are you sure you used the same TV inputs as before? And the same PC output? Are there other possibilities?
- Windows version. (Borrow a laptop with XP or Vista or something).
- Driver update or rollback. Can you identify the version number of the XP version? Is there a W7 or Vista version at similar version obtainable?
I recall an issue of seeing the brief PC image on TV. I'll edit if I remember where/when/how.