HT1533 Ok so I have tried evey combination of restarts. It tries to boot up, the start up bar appears on screen, but the computer just goes completely after the bar is a third of the way across. Is is doomed?

Ok so I have tried evey combination of restarts. It tries to boot up, the start up bar appears on screen, but the computer just goes completely after the bar is a third of the way across. Is is doomed?

Have you tried booting into the Recovery HD and running Disk Utility to see if anything needs fixing on the HD. Restart holding down Command+r and once it hopefully boots select Disk Utility>Repair Disk. If anything gets fixed click on repair disk again until you get a clean pass. Try restarting as normal from the Apple menu once done.
Do you have backup to restore from if it proves to be the Mac has a hardware fault?

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