Vintage PowerBook display & PRAM issues post-HDD replacement

Hi


i have a vintage Powerbook question…


I was switching out the hard drive recently. When I powered up the screen was lit but then dimmed automatically (the screen had been working fine) had random horizontal lines and I can’t see the desktop in the background.


So I got the Apple video adapter cable to connect to the external port and a 10 dip switch adapter to connect my HP1907 vga monitor.


When powering up I get a desktop pattern but no desktop icons. I can’t select mirroring settings because I have no internal screen.


Tried to zap the PRAM but the computer doesn’t give me the second chime. This is odd. I’ve never had this happen on any of my macs.


Looking for a solution. Thanks!

Posted on Jul 6, 2026 7:29 AM

Reply
53 replies

Aug 30, 2026 2:53 PM in response to beigebox

So I managed to connect my PB180 to the 7600 via the special target disk mode HDI30 cable. Worked like a charm and simply copied the contents of the PB180 hard drive which has OS 7.5.3 to another one in the 7600.


The other drive in the 7600 is one partition and has OS 7.5.5 running on it. Is this safe? Should I “unbless” the 7.5.3 system folder?


I know best practice is to partition the drive but it would take a long time to copy everything back to it.

Aug 30, 2026 5:02 PM in response to beigebox

A partition must only contain one active system folder.


For example, copy the contents from the PB 180 to a new folder "files from PB 180" on a PM 7600 System 7.5.5 hard disk partition. Make sure that the System 7.5.3 system folder inside the "files from PB 180" folder has been deactivated (rename this system folder "OLD System Folder" and drag the System suitcase out of it).

Vintage PowerBook display & PRAM issues post-HDD replacement

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