-
- Blank
screen on wake from sleep:
- Workarounds
include turning off Energy Saver in System
Preferences; manually selecting sleep then
waking machine a few times (closing and
opening laptops will work, too); press power
button to produce shutdown dialog box, then
cancel shutdown; and, changing your screen
resolution in System Preferences ->
Displays pane. If this problem is persistent,
there may be some sort of software conflict
going on, something running in the
background, or it could be hardware
related.
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-

- Machine
wakes to blank screen.
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- Kernel
Panics:
- These may be
related to a specific application or utility program, a
corrupt Operating System file, or they may be symptomatic
of a hardware issue. Use Disk Utility to repair
permissions (startup from your OS CD or DVD disk 1 if
necessary), repair permissions and verify/repair hard
drive. See Kernel Panics section for more grisly details
(link in sidebar, left).
-
- Startup
with command-line prompt:
- Machine's
PRAM needs to be reset. Restart, then _immediately_ press
key the combination Command+Option+P+R until you hear two
startup tones. Or, reset PRAM from the command-line by
typing "reset-nvram" then press Return Key, followed by
"reset-all" at the Open Firmware prompt and another
Return (assuming firmware is not password protected).
Your machine should now restart normally.
-
- Abnormal
Startup tones:
- If you hear a
series of beeps on startup, it usually means one or more
RAM DIMMs have either failed or were just installed and
are out of spec. Remove any third-party RAM and try
restarting. If all installed RAM is original equipment,
try removing one DIMM at a time between restarts until
failed RAM is identified.
-
- Blinking
question mark on startup:
- This
usually means the Operating System cannot be
found, and causes range from simple to
severe. First suspect is whatever was
installed or changed last time the machine
was running. Try starting up from your OS CD
or DVD, and try to undo whatever change was
made previously - and Run Disk Utility on the
hard disk while you're at it. Make sure you
have a startup disk selected in System
Preferences -> Startup Disk pane. If
machine still refuses to startup, it may be
time to bring it in for analysis;reinstalling
your Operating System is usually a last
resort. If your hard drive is malfunctioning,
data recovery services may be
required.
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-

- Machine
unable to locate an Operating
System.
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-
- System
Preferences (controls) not responding:
- Check cables
and connectors first. Move keyboard and mouse to a
different USB port, and make sure connectors are firmly
seated. Sometimes moving a window will prompt a screen
refresh (not a good sign, by the way, especially if
cursor seems to hang periodically). You may have run out
of memory (RAM), or perhaps you need to force quit an
application that has stopped responding.
-
- This might
also be the result of having more than one System
installed on a single drive or partition. Utility
programs (including Disk Utility) will find nothing
wrong, application software may operate normally, but
device drivers can seemingly "disappear" and all sorts of
confusion can result. Only one OS is allowed on an ATA
volume; backup copies must reside on a different
partition or volume. Use modified dates and file size
information from Get Info windows to sort out unnecessary
OS copies.
-
- Machine
refuses to boot from OS CD/DVD, or OS installation
fails:
- System disk
may be defective. If pressing "C" key, "D" key or Option
key during startup doesn't work, either that disk is not
a bootable disk or is has been damaged. See if the disk
appears as an option in the Startup Disk control panel
(System Prefs). Sometimes a CD/DVD can be repaired, so if
the disk in question is a known-good OS disk - or at
least it used to be - it might be worth taking to a video
store to be polished.
-
- One giveaway
symptom of a corrupt/defective disk is if CD/DVD's
installer program has a generic "dog-eared page" icon.
Another check is to boot from any available System, then
open the suspect disk's window; an alias should appear
named "Install OSX." Select the installer alias and
choose "Show Original" from File Menu; if this results in
a disk error message, the System CD is kaput.
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