IMac 21.5 (mid 2010) screen start-up issues

Hi
Last week I started having problems with my iMac.
The screen is breaking up during start-up with loads of small squares in a grid. Then the screen goes blank grey the grid of squares come back and start-up gets stuck.Please see image.
Any help would be appreciated
Thanks
Scott

Doesn't hurt to make some trouble shooting before taking it to repair. But before making tests make sure to take backup of your data. Start by starting up in “safe mode”.
1. Shut down your Mac and wait 10 seconds.
2. Press the power button.
3. Immediately after you hear the startup tone, hold down the Shift key. You should press the Shift key as soon as possible after you hear the startup tone, but not before.
4. Release the Shift key when you see the gray Apple logo and progress indicator (spinning gear).
To leave safe mode, restart your Mac normally without holding down any keys during startup.
Once you have your data in safe place try to make some test to determine if this is a hardware related problem or something else.
To start with follow these simple guides:
Intel-based Macs: Resetting the System Management Controller (SMC)
OS X Mavericks: Reset your computer’s PRAM

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