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Boots, Fan runs fast, then black screen <<SOLVED>>
My computer starts up, all 4 LED lights are on solid green. After about 5 minutes the fan speed starts noticeably increasing. 5-10 minutes later the screen goes black and the #4 LED goes off, leaving LED's 1 through 3 solid green. The iMac doesn't shut down and fan continues to run until I hold power button down to shut it down.
If I restart immediately, the screen lights up & the same situation happens. If I wait for a while to reboot, it seems to cool down & the fan speed is normal for about 5 minutes and the same symptoms repeat.
I have: held power switch down with power disconnected for 10 seconds, reset PRAM, installed a new HDD & tried fresh install of Mountain Lion (only because had to get data off previous one).
Any help greatly appreciated!
iMac 24" 2.8 GHz EMC No. 2134
<<Answer to question, Nothing happened before this starting iMac was working fine & no electrical surge issues >>
**Problem Solved, I decided to take my iMac in to local repair shop, the replaced the video card for $250. Unfortunately they didn't Zap the PRAM so I kept getting error messages when trying to install Lion or Mountain Lion, but after zapping PRAM work great. Thanks very much for the replies !!!
Edited by: Craig Bender ( ) , ABCellars ( )
What happened before? Did you have another problem which you tried to fix? You problem appears to cover a few different areas which makes this hard to isolate out whats going on here. At first I would suspect your power supply but the fans running at high speed implies the logic board is getting power but has something over heating. The Dialogistic LED's implies the inverter and/or GPU/LCD has a problem. Did your system get hit by a power surge?
Dan,
ABCellars - He claimed the #4 LED went OFF which is the Inverter or GPU/LCD error.
Dan,