model 1229 won't boot anything,
mac book pro started up, loaded the desktop and then started rebooting endlessly. the apple logo and progress bar appear, the progress bar partially fills in, then the machine starts to boot again. if i boot in a different mode, sometimes it simply stops, sometimes i get the 'To use English as the main language, press the return key" which i press, but nothing happens and i have to power down and start over.
I have tried safe boot, boot from recovery partition, boot from install disk, boot from install flash drive, boot from bootable external hard drive. I removed the hard disk and successfully used it to boot my mac mini. I reseated the ram, reset the PRAM, reset the SMC.
Anything else i should try? there is a lot online about disk problems that cause booting problems, not much on hardware.
Is this a good question?