Troubleshooting:Asus N56VZ black screen after windows install / restore

Asus N56VZ black screen after windows install / restore

Hi
I have a 1 year old Asus N56VZ which had Windows 8 pre installed.
I decided to do a factory reset (there is a recovery partition on the hard drive) which would include formatting the C drive.
The reset worked and I logged into windows 8 again.
The asus software and windows were doing updates and I left them overnight.
The next morning I found the laptop on but with a blank black screen - no mouse cursor, nothing.
I pressed the power button for  4 seconds to power off which it did.
I then switched it back on and it comes on but the screen is black (back light is on).
There is no hard drive activity.
Now every time I switch on, I just get a blank black screen.
I have tried pressing F9 or delete to get into the bios but nothing happens.
i removed the hard drive and put it into a caddy so I could connect via USB to my other laptop and copy the data across (from the D drive).
i reinstalled the hard drive into the Asus but there is no change whatsoever.
I do not have the license key for Windows or a DVD version of W8 and cannot access the bios either.
In fact none of the key presses have any effect.
Does anyone have any ideas what I could do?
Is there a way to do another reinstall from the recovery partition?
Thanks :)

Keys to the Problem Asus N56VZ black screen after windows install / restore

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Manually editing the Windows registry

Manually editing the Windows registry to remove invalid MACHINE_CHECK_EXCEPTION keys is not recommended unless you are PC service professional. Incorrectly editing your registry can stop your PC from functioning and create irreversible damage to your operating system. In fact, one misplaced comma can prevent your PC from booting entirely!

Caution: Unless you an advanced PC user, we DO NOT recommend editing the Windows registry manually. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. We do not guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

To manually repair your Windows registry, first you need to create a backup by exporting a portion of the registry related to MACHINE_CHECK_EXCEPTION (eg. Windows Operating System):

• Click the Start button.
• Type "command" in the search box... DO NOT hit ENTER yet!
• While holding CTRL-Shift on your keyboard, hit ENTER.
• You will be prompted with a permission dialog box.
• Click Yes.
• A black box will open with a blinking cursor.
• Type "regedit" and hit ENTER.
• In the Registry Editor, select the Error 0x9C-related key (eg. Windows Operating System) you want to back up.
• From the File menu, choose Export.
• In the Save In list, select the folder where you want to save the Windows Operating System backup key.
• In the File Name box, type a name for your backup file, such as "Windows Operating System Backup".
• In the Export Range box, be sure that "Selected branch" is selected.
• Click Save.
• The file is then saved with a .reg file extension.
• You now have a backup of your MACHINE_CHECK_EXCEPTION-related registry entry.

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