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Quadra 605 no bootup

opualuan

Active member
Quadra 605 has been solid for months. Forgot to reinstall the microSD card in Bluescsi, flashing question mark on startup. Turned off, reinstalled, startup chime, gray screen, cursor freezed after 1 second, doesn’t boot.

Removing everything I can from the system, pram/reset switch doesn’t help. Power supple rail voltages look good. Never been recapped, but caps look ok… does this sound like a capacitor issue? Appreciate your ideas…
 

Juror22

Well-known member
I can guarantee that any Q605 will need caps by now, although the timing is a little strange, I'll admit. You may want to check your SCSI cable (did you remove the SCSI cable along with the Bluescsi?) is the floppy still attached? What does it do?
Just washing the board (thoroughly) may help (temporarily) if it is having cap issues. Not always, but it has worked for me in the past.
 

Byrd

Well-known member
Check PRAM battery is good - otherwise you can do the "double tap" PSU switch trick to get it to boot, hopefully.
 

opualuan

Active member
Pram battery is a few months old, voltage good. Double tap doesn’t help, as the video does come up properly. Even with floppy and scsi cable detached, pointer freezes up and no blinking question mark. With nothing at all plugged in except power/vid/adb, is this expected behavior?

I’m not certain if it’s ever been recapped, when I bought it there was a full 040 with fpu so the prev owner did make some updates. I’ll try recapping and see where that gets me.
 

opualuan

Active member
Appreciate the offer, but after looking at it closely it was clear- original caps and leaking underneath. Cleaned up and replaced with tantalum today, booting up! Next, recap the PSU…
 

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