Please read the warranty paperwork that came w/your computer.
You have 14 days to return the computer w/no questions asked.
You have 90 days of FREE phone tech support on top of your standard 1 year warranty unless you also purchased AppleCare which gives you an additional 2 years of coverage plus FREE phone support.
Strongly suggest that you take FULL advantage of the above before it runs out. Let Apple deal w/the problems.
If you DIY and mess up, your warranty will be VOIDED!
Thanks BB, although it is 6m old and sadly out of the 90 day deal it is essentialy new as I have been overseas and not used it, so I would not be expecting a part failure, Apple quality is generally good that way. I was hoping someone might have had similar issue and there might be a quick fix, but probably I will have to hump it along to the neatrest apple repair centre.