Change resolution and nothing works now

I changed in a game my resolution and monitor tued to black saying "change your resolution in 1900x1200", when restart pc it keeps saying the same thing from very start (i mean i can't see nothing not even bios boot nothing at all). I tued to mother's board onboard graphic card in order to make it to safe mode. When windows load and updated graphic cards drivers (this on board) BOOM the same message appeared. I restored pc in previous time. I made it again to safe mode (with onboard card), and deleted all graphic drivers, when i restarted pc .......... "change your resolution......". I change even HD with other OS (hopping to start) but the same problem.

What i tried, -change from Nvidia GTX 560 to onboard (this works until safe mode) -replaced RAM -changed HD -Removed graphic drivers and reinstall for both cards (after install's restart , same problem arise) -Recover windows in previous time

Now display two messages :

-with onboard graphic card = "change resolution to...." -with 560 = "Check display cable"

These messages appears from very start meaning i can't do nothing (GTX 560). Only with on board i can make it throw safe mode where the resolution appears to be 800x600........ PLZ give a hand..... TY in advance

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