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I had this, had to use a different USB port in the end. Could be worth a try? Equally, does it show up in Disk Utility? Worth re-formatting perhaps?

So, all sorted now... In case this is of some help to someone else in the future, I ended up doing the following: DOS bootable USB (with Win98 system files) fpt -f h87hd3.f3 -bios This re-flashed the BIOS from the non-working F8 back to my previous F3 version. (Normal warnings around BIOS...

Next attempt is to use FPT to re-flash the previous BIOS now...

Hmmn, so seemingly I can't downgrade back to my previous BIOS version (F3) Tried using QFlash and a bootable DOS USB with efiflash to no avail!... Any other suggestions out there at all??

Hi, Recently updated to 10.9.4, all been going very well. Have been experiencing some random hanging on occassion though. Attempted to resolve by a number of approaches, one of which was updating my BIOS to F8 (from F3). Now when booting it just hangs. I can boot in safe mode. Re-running...