Recently installed dvd drive and get the following error message on startup, the system extension "/System/Library/Extensions/IOSCSiBlockCommandsDevice.kext" was installed improperly and cannot be used. Pointer is frozen in upper left hand corner.

Question

I thought extensions were not used by Tiger?  Tried disk utility, restart, any suggestions would be appreciated. Thanks!

Answer 1

frybicki wrote:
I thought extensions were not used by Tiger?  Tried disk utility, restart, any suggestions would be appreciated. Thanks!
There are bunches of kexts loaded in Tiger; you can see them in System Profiler.  The info from my TiBook shows the following:
That being said, you might want to do an NVRAM reset, since you have made a hardware change.  Boot into open firmware by holding down the cmd-opt-O-F key combination until you get to the white OF terminal screen.  Then type the following two commands:
reset-nvram <enter>
reset-all  <enter>
which reboots the machine and forces it to rebuild its device table.
If that doesn't work, you may have a damaged kext cache file, which will require some single user skulduggery.  This one is a little more complicated but may also clear up the problem as well.  You can boot into single-user mode by holding down the cmd-S key combination as you boot until you get to a black Unix terminal screen.  The routine goes like this:
/sbin/mount   -uw   /   <enter>
cd   /System/Library   <enter>
rm    Extensions.kextcache  <enter>
rm   Extensions.mkext  <enter>
touch   Extensions   <enter >
shutdown   -r   now  <enter>
The last command does a graceful shutdown and then reboots the machine.  This will force a rebuild of the extensions cache files which may clear up your problem.