Q: Yosemite on SSD wont boot and wont go in safe or recovery mode

Two days ago I upgraded my MacBook Pro to Yosemite.

The Problem: Today, My MacBook Pro won”t boot the OS. I have my OS on an SSD with a trim enabler. I”ve tried to boot in the safe mode, recovery mode - wont work. Made an USB  drive with Mavericks and tried to do a fresh install on the SSD - can”t do it ! After I select the USB drive at the start, the sistem is loading for 30 seconds - 1 minute, and after that I get a blue screen !!! Today I was able to boot the SSD after presing option button at the start, but that happend only once. After that - no luck.

Any ideas on what should I do?

PS. At one moment before this happend I got my desktop all pixeleted, like it was an graphic card fault, I”ve restarted the MacBook and all this „fun” started? Any ideas?