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i was using my imac g5 and the screen suddenly went grey. apple said it was a bad lcd screen. i replaced the screen still has same problem. i boot up it chimes high fan comes on and screen is grey as if just the back light is on with no display what so ever. any ideas?
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Try one of these two items first.
1. plug in an external monitor using a mini-vga to vga adapter
2. boot to a CD (OS disc, tech tools, etc...)
if the external monitor shows everything ok and the one in the iMac shows nothing still, then you might have a logic board issue.
If you boot to a CD and everything works fine, then you have a corrupted operating system or a corrupted partition.
For a corrupted Os, perform an Archive and Install to not loose any of your data, or back it up (target disk mode with another Mac is great for this) and reinstall.
If the harddrive is not detectable in the instaler, then the partition is corrupted. Try to fix it using Disk Utility or another tool (tech tools pro works for this, as well as Disk Warrior or other such software). This might repair it completely for you, or you might have to run a repair of the OS (archive and install). Worse case senerio, you lost all your data and you have to reinstall from scratch.
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Start up from your latest system installation disk by inserting the disk and holding down the "C" key. Go to the second screen then the pull down menu. Pull down under Utilities to Disk Utility. Run the repair on both drives. Then restart holding down the P - R- Command _ Shift keys and keep holding till it tones three times. Try restarting now holding down the Shift key. If that works then try restarting normally.
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