iMac won't boot, GSOD with Flashing Question Mark, safe/verbose mode not possible
I have an iMac 24", just over 2 years old running OS X v10.5 (Leopard). Mighty Mouse and bluetooth keyboard, no peripherals.
It slowed enormously over the last few weeks and has now ceased to boot.
On switching on I hear the chime (blank grey screen initially), the grey screen hangs for approx 30sec before the flashing folder/?mark icon appears.
There is no further progress.
Boot key combination results:
Can reset NVRAM (Option-Command-P-R)
- Cannot boot to safe mode
- Cannot boot to startup manager
- Cannot boot to verbose mode
- Cannot boot from target media (DVD etc)
- Cannot boot to AHT mode
- Cannot boot to single user mode
I have followed the steps here http://support.apple.com/kb/TS2570
Disconnect, test peripheral devices and network cables - done - de-powered and rebooted. No difference.
Perform a Safe Boot- this does not work. I am familiar with the boot combinations and timings. The safe boot leads to the same flashing folder/?mark icon. I have also tried verbose, single user, AHT and startup manager with the same result.
Reset the NVRAM / PRAM- done - this worked and kicks the system into an auto-reboot after 3-5 seconds. This also demonstrates the Keyboard is fine. The subsequent boot fails at the same point via normal, safe or verbose boot instructions.
Start from your Mac OS X Install disc; use Disk Utility – I never received an OSX install disk. I have the original box with receipts etc, the only disk present is an unsealed version of iLife (yeah thanks Apple). Where would I get one?
Check your cables and power source – done - all fine.
Remove third-party RAM and internal hardware – not applicable.
Perform an Archive and Install installation of Mac OS X – how would I do this when I cannot boot the device?
Perform an Erase and Install installation of Mac OS X as a last resort – how would I do this when I cannot boot the device?
To me the problem looks like a HDD failure. I had windows (dual boot) professionally installed when I bought the iMac and since the Windows boot option is also not visible (startup manager itself does not work) I suspect the system can’t find bootable media because the HDD isn’t spinning.
An OS corruption would generally affect one or the other but presumably not both Operating Systems simultaneously.
It's hard to be certain, but I’m sure it used to make more noise.
I had a look into opening it up and troubleshooting the physical components but it’s hard to know where to start. There are no obvious ways in and I’m not a professional so decided to post a question here rather than hack it open.
I'd be grateful if you could suggest next steps here, or is it time to go dig a hole in the garden? I certainly expected more than 2yrs life from a £1200 unit.
Many Thanks,
Ryan
iMac, Mac OS X (10.5.8), 2 yrs old, 24"