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?
Is this a good question?