17" Monitor will not come on after power outage last night. Computer boots up, but monitor is blank. Light in bottom right corner is blinking.
PowerMac, Mac OS X (10.6.3)
Is it an Apple Display?
If one of the Apple LCD displays detects an error condition, the power LED will flash in a certain pattern to indicate the issue.
Pattern Meaning
short, short, short
The display is detecting wrong video format or an unsupported resolution.
Verify that your equipment is compatible and restart the computer. If the issue continues, reset the PRAM.
short, long, short
Make sure you are using the correct power adapter with the display. This alert will only appear on displays built in 2004 or later which require an external power adapter.
short, short, long
The display is detecting a backlight error. Check your display's power connections and restart the computer. If the problem continues, contact Apple or an Apple Authorized Service Provider.
Pattern
Meaning
short, short, short
The display is detecting wrong video format or an unsupported resolution.
Verify that your equipment is compatible and restart the computer. If the issue continues, reset the PRAM.
short, long, short
Make sure you are using the correct power adapter with the display. This alert will only appear on displays built in 2004 or later which require an external power adapter.
short, short, long
Is it an Apple Display?
If one of the Apple LCD displays detects an error condition, the power LED will flash in a certain pattern to indicate the issue.
Pattern Meaning
short, short, short
The display is detecting wrong video format or an unsupported resolution.
Verify that your equipment is compatible and restart the computer. If the issue continues, reset the PRAM.
short, long, short
Make sure you are using the correct power adapter with the display. This alert will only appear on displays built in 2004 or later which require an external power adapter.
short, short, long
The display is detecting a backlight error. Check your display's power connections and restart the computer. If the problem continues, contact Apple or an Apple Authorized Service Provider.
Pattern
Meaning
short, short, short
The display is detecting wrong video format or an unsupported resolution.
Verify that your equipment is compatible and restart the computer. If the issue continues, reset the PRAM.
short, long, short
Make sure you are using the correct power adapter with the display. This alert will only appear on displays built in 2004 or later which require an external power adapter.
short, short, long
Yes, it is an Apple display. The light is short, long, short. Nothing has changed as far as any power adapter. The only thing that has happened is that there was a power outage, and now the monitor will not come back on.
It would help to know more about your computer. "PowerMac" covers a decade. To get more information about your computer, go to the Apple in the upper left corner of any window, then "About This Mac", then "More Info..." Copy and paste the information here, but omit the serial number and Hardware UUID (if present).
How long has it been since you changed the PRAM battery? It could be your PRAM is corrupt. I remember monitor issues when I bought a used computer and the battery was nearly dead. A computer will run fine with a bad battery and through a normal restart, but come the next compete power down it forgets all its settings, and can make a mess of those that exist such as display settings.
Tried a PRAM reset?
Texas Mac Man's PRAM, battery, PMU tutorial - https://sites.google.com/site/macpram/mac-pram-nvram-cuda-pmu-battery-tutorial
Resetting your Mac's PRAM and NVRAM - http://support.apple.com/kb/HT1379
When to reset NVRAM or PRAM - http://support.apple.com/kb/HT1895
Can't provide that information since the monitor will not come on. It is a G5 Power Mac though.
I presume the power supply or Monitor got damaged during the power outage. 😟
IT\t would help you and us to confirm your Mac's model. We stil have a conflict in your equipment line, which says you have a PowerMac but the OS is 10.6.3. No PowerMac can run higher than 10.5.8.
Does your computer have one ot two drive doors?
Have replaced the power supply with an identical power supply...still has a blank monitor and the led flashes short, long, short.
Specify which display specifically you are using. At this juncture everything suggests that it is the display that is potentially dead.
Try pointing to the correct display that you have from the options here:
It is actually a 20" aluminum cinema display
Looks like a A1081
Ran across this... thought you'd give it a look.
How to: Fix Short-Long-Short Apple Cinema Display
Okay...isolating the center pin with tape works. So what does that mean? Is the monitor, cord, or power adapter bad?
Great find! 🙂
According to one on that site...
MeerschaumSteve10 months ago
To the people using this tape method to fix your Cinema Display. Keep in mind that the problem is caused by a failing 3.3v regulator on the logic board inside the screen case. Taping it will force the screen to keep working, and given time, will probably kill the logic board. The proper repair is to remove the logic board, and replace the 3.3 volt regulator. This regulator is connected to the PSU sense signal pins, so when it fails, it causes the display to think you have a defective power brick connected.
Reply · 3
monitor will not come on after power outage. Computer boots, but monitor is blank. Light in bottom right corner is blinking.
