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As the title says, when I try and boot into a starup manager to install a MacOS on a new HDD I put into an iMac it only shows white screen with cursor on it with nothing else on the screen. Any help is welcome, thanks in advance.
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So that tells us the onboard GPU has failed!
Most likely you have the NVIDIA GeForce 9400M. You’ll need a new logic board with this version 21.5” iMac Logic Board, 3.06GHz, NVIDIA
If you have the ATI Radeon HD 4670 model, you’re in luck! As this version has the MXM graphics board 21.5” iMac ATI Radeon HD 4670 GPU board
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woow, really, there is no other possible problem than dead gpu?
Do you still have the Grey CD/DVD Disks that came with the system? If you do you could try running diagnostics.
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I think you have a deeper issue here ;-{
Are you able to boot up the system in Target Disk Mode? Press the T key when restarting. Do you see the FireWire Icon on your screen?
door Dan
yes, i've tried and target disk mode works
door Uros Rajkovic