Restarting The Computer; The Monitor Is Dark After You Turn On The Computer; Flashing Question Mark On Start-Up - Power Computing PowerTower Pro User Manual

Chapter 4, Troubleshooting

Restarting the computer

You can eliminate some common problems by restarting the computer, which clears the
computerÕs memory.
If the mouse is still working, choose Restart from the Special menu. If an error dialog
box is displayed, it may have a Restart button.
If the mouse is not working, try holding down the
the Power On key. This key combination restarts the computer, but should only be used
when you cannot use the Restart menu command.
If you cannot restart the computer from Mac OS, use the Reset button on the front
panel. See the beginning of this manual for diagrams illustrating the location of the
button. Be careful not to confuse the Reset button with the Interrupt button, used by
programmers.
If the Reset button does not work, use the power button on the front panel to turn off the
computer. Wait at least ten seconds before turning it back on. (You need to wait to give
the hard disk time to spin down.)

The monitor is dark after you turn on the computer.

Follow the suggestions under ÒProblems starting upÓ on page 10.

Flashing question mark on start-up

In order for your computer to start-up successfully, the computer must have a valid System
Folder to start from. A ßashing question mark indicates that the computer is unable to locate
a valid system folder on the hard disk or any other bootable device (i.e. a ßoppy disk, the
CD-ROM, etc.). This is typically caused by lack of a bootable device, a device interfering in
the boot-up process, or a corrupted System Folder.
1.
VERIFY that all external SCSI devices such as hard drives and scanners
are turned on and properly conÞgured as detailed inÒUsing HDT Primer
PE to test and repair SCSI disks,Ó starting on page 44.
One of the main causes of ßashing question marks is related to poorly conÞgured SCSI
chains.
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PowerTower Pro UserÕs Guide
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and Control keys while pressing
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