It won't boot. Power up, beeps, fans come on, and power light lit. I tried all the resets plus popped the hard drive and ram to no avail. Called apple support and they had me go through it again - all except popping the memory and hard drive. Got an appt. with the geeks at apple shortly. I did find out that even though you've got a warranty you need apple care before you can get support so I had to buy applecare.