Weird booting inconsistencies, PRAM reset not working
This Ebay purchase has a rich variety of unsatisfying boot up scenarios: Sometimes it boots very slowly with the HDD disc with which it came, sometimes it shows me the EFI lock asking for a password, sometimes only grey screen. After a few painfully slow boots I exchanged the HDD for a good SSD, I tried SMC reset, responded OK, light change on mag. Then I tried PRAM reset, which it flatly refused to participate in. Just now it chimed, fans on full speed, question mark.I tried booting of external drives, still no luck, just grey screen. Just now I put in the slow HDD it came with, and it boots, ever so slooooowly.
Then I put in another known good SSD, and question mark folder again….
My question is: WTF? And how can I restore the PRAM reset function?
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6 Комментариев
It consistently now boots of the HDD it came with, but refuses so two SSD drives with known good function. How can this be. And still no PRAM reset possible...
из Jurgen
What are the make and models of the SSD's you are using?
из Dan
Thanks for responding, Dan. The SSDs I am using are my usual Kingston A400 120 GB and 240GB, which I have been using on all my 2009-2012 MBP upgrades now for a while, and successfully. The specific ones here are booting fine in other 2010 24.Ghz MBPs. I just did a whole software update hoping to resolve the PRAM isue, but no cigar …yet. I even checked the keyboard functions for p, r, and option, all OK
из Jurgen
OK both the Kingston A400 SSD's are listed as supporting both SATA II (3.0 GB/s) & SATA III (6.0 GB/s) so that removes that issue as your 2009 can only support SATA II drives.
из Dan
Yes, the A400s do work well in those machines. I tried some more boot patterns, such as Safe mode (shift) and command R , and none of the commands register, it just goes to the apple logo, or in case of Com/R is went to the locked EFI screen. Is it not called SPI mode when the computer responds to commands before the OS loads? It seems that mode has issues. Any clues?
из Jurgen
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