IMac modell 8.1. will not boot, screen issues

Hi!
My iMac 24" modell 8.1. (IC2D - 2,8 GHz) will not boot from install disc OS X 10.6. When I turn the machin on I hear the sound ok, then the grey screen appear with the black apple logo and the spinning wheel starts up. Then nothing happens. I hear that the superdrive is spinning up with the install disc, but nothing happens on the screen.
The screen has much flickering/distortion, so I removed the LCD display and checked all the three cables between screen and logic board to see that they are secured.
I have installed an 2 TB HD in this iMac formatted in Mac OS X extended journaled. The 4 LED lights on the bottom of the logic board are on and green. Remember back with my PM G5 that I had to push a cuda button, is there any such button on this iMac?
Any suggestions?

Eric Ross wrote:
You need to start the iMac with the original DVD that came your with your computer. Then run disk utility to repair your hard drive and premissions. http://support.apple.com/kb/TS1417
No, you want to run DU from whatever version is on the boot volume. The original version it shipped with was 10.5, but if it's now 10.6, he wants to use a 10.6 disc to repair with.
For the video symptoms, I would run the Hardware Test, in extended from the 10.5 disc, if it will boot to that.
http://support.apple.com/kb/ht1509
And Roam's suggestion to try a Safe Boot is a must.
EDIT: Permissions Repair should be done -- and I don't think this is appropriate to do now, anyway -- from the normal boot volume, not from the DVD. And, certainly not from the original disc.
Message was edited by: WZZZ

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rccharles wrote:
kurtklatt wrote:
Hello,
I'm an A+ PC technician and I'm trying to get an G3 iMac Indigo back up and running for a friend. I own a G4 Mac Pro so I'm somewhat familiar with Mac hardware and OSX and System 9.
Here's what I've done so far to get this little machine going again and it symptoms presented when I received it:
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seeing the smiley Mac means that you have a classic version of Mac OS installed on the hard drive.
2. When alternately booting using the option key to get to the drive option screen it would only show the HD and no CDROM drive. No other key combination would change this (CMD-OPT-P-R zapping the PROM) or booting into Open Firmware and reset-all.
you need to have a bootable CD in the drive for you to see the CD in a drive. Mac OS X works with media not devices.
I have a bootable System 9.0.4 CD.
only show the HD
So, Mac OS is showing a bootable partition, not a hard drive.
3. I purchased a retail copy of System 9.0.4 that is bootable (I checked it in my G4 system) and held down the "C" key to boot from the CDROM-No go-as well as the Option key-no CDROM displayed.
See Richard's second paragraph having to boot up from the original cd to get cd reader to work again.
http://discussions.apple.com/thread.jspa?messageID=5966197#5966197
I'll try disconnecting the HD and leaving the CD drive connected to see if this works however it should be set as master on the cable.
4. I removed the HD, changed the jumper to slave and installed the HD in my G4 Mac and checked the drive integrity via OSX Hard Drive utility and the HD was repaired. The HD had a version of System 9 installed. Once the HD was reinstalled the G3 would still not boot.
Did you set the harddrive to master? Master is a must. Cable select doesn't work. You need to set the hard drive to master mode. There is usually a label on the hard drive that tells you what jumpers you need to set. If you are not sure, give us the name and model number of the hard drive and usually someone will be able to tell you how to set that drive.
Did you check all of the cables? Put everything back and verify that all works.
The HD is set to Master and the CD is set to slave with the correct jumper settings and the cable is attached.
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I suggest that you reformat the drive then re-installed your software.
When I did the clean install of MacOS 9 it was after a reformat and reinstall of the OS.
6. I purchased a used replacement CDROM drive and installed it in the system-still no boot, no drives attached, nothing changed via zapping the PROM.
7. I changed the jumper settings in the G3 to master for the CDROM drive on the new CDROM and Slave for the HD. Still no boot,no drives displayed, zapping the PROM-no change.
8. Today I changed the PROM battery by exchanging the PROM batteries from my G4 system to the G3 and there was still no change. The old battery from the G3 is fine since my G4 system rebooted with it installed. I have also reset the PMU switch after the battery install.
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http://docs.info.apple.com/article.html?artnum=58583

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IMac modell 8.1. will not boot, screen issues

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