Invalid memory access errors
I have frequent boot problems with my 1 GHz 17" PowerBook. When I depress the power button, I often hear the SuperDrive start up but not the hard drive, and the screen stays black. I can tell power's on by depressing the all-caps key and getting the indicator light. Depress power button till shutdown, try again.
Occasionally, I get a white screen with the following error message:
Invalid memory access at %SRR0:00014000 %SRR1:01400000
The rest of the message lists the Boot ROM version and asks whether I want to shut down or continue booting.
If I type the mac-boot command at the prompt and hit return, I get the first boot screen, but it goes into perpetual cycling.
I try booting enough times, finally the hard drive will start up and the boot process moves apace. Sometimes it works after a few tries. Sometimes it takes half an hour. Sometimes I give up.
I removed the original RAM card and inserted a brand new 1 GB card, did not correct the problem. Is it possible my boot ROM has a problem?
On this same computer, the internal Airport Extreme card malfunctioned a couple of years ago. For a long time that caused complete crashes on attempted boot much (not all) of the time. Everybody on this board thought it was a motherboard problem, when it was just a problem with Airport. That thing's still in there, just not functioning. It quit causing interference that made the screen look scratchy. Might it still be involved in the boot problems? Computer diagnostics don't even show it's alive.
Occasionally, I get a white screen with the following error message:
Invalid memory access at %SRR0:00014000 %SRR1:01400000
The rest of the message lists the Boot ROM version and asks whether I want to shut down or continue booting.
If I type the mac-boot command at the prompt and hit return, I get the first boot screen, but it goes into perpetual cycling.
I try booting enough times, finally the hard drive will start up and the boot process moves apace. Sometimes it works after a few tries. Sometimes it takes half an hour. Sometimes I give up.
I removed the original RAM card and inserted a brand new 1 GB card, did not correct the problem. Is it possible my boot ROM has a problem?
On this same computer, the internal Airport Extreme card malfunctioned a couple of years ago. For a long time that caused complete crashes on attempted boot much (not all) of the time. Everybody on this board thought it was a motherboard problem, when it was just a problem with Airport. That thing's still in there, just not functioning. It quit causing interference that made the screen look scratchy. Might it still be involved in the boot problems? Computer diagnostics don't even show it's alive.
PowerBook G4 17" 1GHz, Mac OS X (10.4.7)