iMac 2010 i7 stuck on reboot cycle

[brucem91]

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Hello everyone. For the past few days my iMac has been stuck in a reboot cycle. The machine will boot up, stay on login screen (or if login the desktop), and roughly 10-20 seconds later will initiate a reboot. I found a fix, unfortunately it is a temporary one. It seems that if I reboot my iMac into safe boot I can sucessfully run a permissions verify and repair. That seems to fix it for roughly the next 2-3 boots, and then I am back to reboot cycle. Any advice? I really need my iMac this week due to the boat-load of cpu rendering I will need to do for my final project at school.

Thanks

BruceM

 

[brucem91]

Anyone have any ideas? My iMac now seems to not even boot into safe boot.

 

[NutsNGum]

Reinstalling the OS a possibility?

 

[brucem91]

Reinstalling the OS a possibility?

Possibly, but so far I've been unable to find my original restore disc or boot up my iMac with my 10.6.0 retail disc.

 

[brucem91]

Update: So two OS installs (update to lion, and then clean snow leopard install), and I am having boot issues again on the same machine. The boot doesn't cycle, but every few boots my iMac boots into Safe Mode. I would really not prefer to do another reinstallation at this time. Is their anything I can do other than the normal SMC reset, PRAM reset, or permissions check that I can do?

Thanks,

BruceM