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If you have the operating systems disk, you can boot from the disc, and once the setup come dump, choose password reset from the "utilities" drop down menu. Change your password, shutdown, and reboot.
Boot it into single-user mode holding down Command(Apple) and S buttons when powering up. Then in terminal console, use chkdsk -fy. Use it and use it again until comes back with something like "Volume appears to be OK". Then use command: mount -uw / and then type reboot and try booting normally.
-juuko
Power the machine down. Press the power button, then immediately press and continue to hold the shift key. This will perform a "safe boot," skipping any of the boot-time software you may have added to your machine. If it still fails to boot, more involved diagnostics are required.
Just remove ur CMOS battery and harddisk connection from motherboard. And then try to restart it will give u a msg no boot device or OS found.. Now reboot and add the CMOS battery and harddisk on motherboard...
Use the install discs that came with the machine. Insert the disc 1, shut down the machine, turn it back on and press and hold the option key until the DVD icon shows. Then click on the icon and then click on the right arrow. When the disc boots you need to go to the top and find the disc utility folder. Then select reset password. Then choose restart.
I am going to have you take your Mac into Safe Mode to see if we can't remove a possible folder(s) that may be affecting your Mac's start up function.
Try these steps:
-SAFE BOOT MODE- • Reboot your Mac • Upon restarting your Mac, press the Shift key. • Hold the Shift key until you see a White Screen with Gray Apple icon and eventually a spinning gear. • When you see the Spinning gear, release the Shift key. • Allow the Powerbook G4 to continue booting up. Also this may take a little while (NOTE: this may take anywhere from 5 to 15 minutes to load to the Safe mode screen depending on the performance of your Mac, but if it exceeds this time, shutdown your Powerbook G4 and try just once more. It may have just frozen up the first time around for you.)
• You are going to enter the Safe Mode (which looks like your main desktop environment - the only difference is certain start up items are disabled.)
• Once within the Desktop in Safe Mode • From the Finder Menu, click Go> Go to Folder • Type in this line: /System/Library/StartupItems • This path, is going to take you to the System Library folder which has all of your Mac OS X Startupitems. • Remove all of those folders to the Trash.
*Reboot your Mac normally and see if you can access your normal User desktop environment.
At times this procedure does help for gray screen issues so give this a try and let me know if this helps.
It may be that you have a scheduled boot up set. Go to system preferences and then to energy saver in the bottom right corner there is a button named schedule click on it see if it is set for startup or wake and if it does uncheck the box. Hope this helps.
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