Cannot go past white screen
early 2008 iMac boots up to half of completed progress bar with Apple logo.
Then pops to white screen. Ext. display-- also white screen. Network to other iMac, shows hard drive working and able to add and subtract files. Have tried all command possibilities I could find involving holding down keys, waiting for chime etc. No change.
Want to diagnose accurately in order to replace the right part when the iMac is opened.
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