Pale strip running down macbook screen

I noticed earlier today a pale strip running from top to bottom on my macbook screen - as if a sheet of tracing paper had been placed over the screen. Assuming it to be a software issue (recently moved to 10.5.8), I rebooted, only the find the strip appear immediately at start-up, and much stronger than before. Here's an photo:
http://markhobbs.files.wordpress.com/2009/08/screen_strip.jpg
I'm a little concerned this might be a hardware problem, caused possibly by the screen hinge (the left-hand side of the strip coincides exactly with the beginning of the left-hand edge of the hinge). Any help appreciated.
Thanks
Mark Hobbs

I agree that it's a hardware issue. You could try running the Apple Hardware test (inserting install disc 1 and holding down the D key), but if it shows up at startup as well, I'm fairly certain you're looking at damaged hardware that needs to be repaired.
~Lyssa

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