IMac early 2008 screen not working properly, lots of lines on screen, re appearing and disappearing at random(normally slowly), computer fine on external screen, any suggestions?

This seemed to happen very suddenly; I left my iMac running while i went out and came in to find that the screen was totally unusable, as you will be able to see from the picture it has a lot of lines that seem to come and go a random and sometimes it goes black all together. What do you think is wrong with it? Logic board? Graphics card? Screen itself?.. also if it is the graphics card, is it separate to the logic board or do both need to be replaced?
Also some additional info:
iMac Early 2008
2.4ghz
4gb Ram
OSX 10.9.2
ATI Radion HD 2400
Actual computer working on external monitor, just not internal
Thanks

Costs vary by area, I think you may find out though that spending money on a 6+ year computer may not be worth it, you can buy an Apple Refurbished Mac with much more up-to-date specifications and save hundreds of $s. If this is of interest you can only find them on Apple's on-line store, in the US the current link is:
http://store.apple.com/us/browse/home/specialdeals
Then click the link to the iMacs. If you don't find one you want, continue looking the inventories change frequently, sometimes by the hour.

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This is driving me insane.
I have a MacBook, which still works pretty well apart from the fact that over the last few weeks the trackpad started not responding very well.
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