Macbook Air mid 2009 (2,1) Yosemite integrated Mouse and Keyboard dont work (partially)

My Macbook Air mid 2009 worked for 3 months without any problems on yosemite.

2 Days ago the built in mouse stopped working. So did the Keyboard (built in). Right after it woke up from sleep mode. But the light is still on. After pressing the Power button, it asks me to shut it down, so the system did not crashed.

At boot im able to clear the SMC and VFR (?) Ram. Both did not worked. After i reboot, the machine wont respond to mosue or keyboard input. Also usb mouse and keyboard wont work.

I always had to hard reboot the macbook (hold power) After some time, it wouldnt boot. (black screen) After letting it off for like 5 mins, it would boot again, but same error. After some research, and the problems at startup, it might be an EFI specified problem (i think). Reinstalling has only worked for half an day, then after wake up it wasnt responding.

the problem might be caused after the 10.10.2 update. In the update log i couldnt find any EFI-specified updates. (EFI and SMC is also up-to-date)

anyone able to reproduce this error? i cant get it to work again (without reinstalling it)

EDIT: got it working! just repaired the permissions!