Thank you for the additional information, your notebook does indeed have an Nvidea video chip which is the Geforce 7000M, these chips were unfortunately dispatched from the manafacturer in vast amounts when they were defective.
Here is a thread from 2009 regarding the GPU failure, can I ask how long or how old is the notebook.
I also found a separate thread from 2009 regarding a battery recall for your model of notebook (among others) the thread is here
Replacing the MB is a drastic and expensive step, couple of questions if I may;
Who advised you that replacing the MB would resolve the issue.
Does this person have a 100% working MB that has a video chip that is not one of the many defective ones still out there, if the answer is yes to both how much does the MB cost and most important how good/long is the warranty.
I make it my business to avoid commenting on other peoples advice or repair suggestions etc unless their advice is dangerous or completely off, your recollection of the previous repair is somewhat vague so it is not blindingly obvious what the actual repair carried out was, I have included below some of the information that you previously provided and below that a couple of questions that may refresh your memory which in turn will help us determine what the previous repair was;
Last year it started to shutdown and then it would not start it was heating up so i got it fixed and the solution was to replace a chip (Never told what chip)
i was also told that it might not last.
And now nearly 10 months later same problem again i rang them and they could'nt remember what chip but they siad it would'nt be worth it.
How much did the repair cost.
Is it possible that the solution was to "reflow" a chip.
I have asked the second question here because what you were apparently told ties in with a reflow as it is only deemed as a temporary fix + it is common for a reflow to last no longer than 1 - 3 months.