uliwitness
Active member
Hi,
I was hoping someone here could help me revive a Quadra 840av. It seems fine, apart from the power LED being missing (the socket on the main board is there, but there is no LED + cable behind the transparent plastic), but I can't get it to boot through.
When I boot it, I get a proper startup chime, and then I get a grey (black/white checkered) screen with the standard black mouse arrow. I can move the mouse and the cursor moves, but the screen stays that way, it never shows a Happy Mac or "Welcome" dialog.
Very rarely, I get a black "Sad Mac" screen instead with code 0000000F 00000003 which the web tells me is an "Invalid Instruction".
Suspecting that one of the hard disks had died, I popped in a MacOS 8 CD I had around and held C during startup. That didn't change anything either. I also tried a 7.6 CD from a 20th Anniversary Mac, and a CD I burned myself (used Mac OS X Catalina's Disk Utility's Convert menu item to turn the ~24MB .img into a .dmg, then burned that using Finder's "Burn" menu item). Neither of these had any success, still only the grey screen.
I also popped out the motherboard (which showed no obvious traces of leaking capacitors as far as I can tell, but maybe I missed one) and replaced the clock/PRAM battery. No difference, even after doing a PRAM reset using Cmd+Alt+P+R.
Anyone have experience with something like this? Any other things I could try to revive this amazing machine?
Thanks,
-- Uli
I was hoping someone here could help me revive a Quadra 840av. It seems fine, apart from the power LED being missing (the socket on the main board is there, but there is no LED + cable behind the transparent plastic), but I can't get it to boot through.
When I boot it, I get a proper startup chime, and then I get a grey (black/white checkered) screen with the standard black mouse arrow. I can move the mouse and the cursor moves, but the screen stays that way, it never shows a Happy Mac or "Welcome" dialog.
Very rarely, I get a black "Sad Mac" screen instead with code 0000000F 00000003 which the web tells me is an "Invalid Instruction".
Suspecting that one of the hard disks had died, I popped in a MacOS 8 CD I had around and held C during startup. That didn't change anything either. I also tried a 7.6 CD from a 20th Anniversary Mac, and a CD I burned myself (used Mac OS X Catalina's Disk Utility's Convert menu item to turn the ~24MB .img into a .dmg, then burned that using Finder's "Burn" menu item). Neither of these had any success, still only the grey screen.
I also popped out the motherboard (which showed no obvious traces of leaking capacitors as far as I can tell, but maybe I missed one) and replaced the clock/PRAM battery. No difference, even after doing a PRAM reset using Cmd+Alt+P+R.
Anyone have experience with something like this? Any other things I could try to revive this amazing machine?
Thanks,
-- Uli