Chosen Solution
I have a Apple A1010 laptop that when you turn it on, it chimes and goes to grey screen and doesn’t do anything. It is not the hard drive or the memory because I tested them in another laptop.
I guess you tried all usual troubleshooting stuff like reset the pram, reset the PMU, boot from external source, boot in single user mode, fsck scan, connect the PB to an external monitor, etc ?
Test the RAM in another laptop, could just be bad RAM.
