System freezes and then will not reboot

About two weeks ago I opened my MacBook Pro, just before a business trip only to find that it would not start, just a grey screen, if I left it long enough then the apple logo appeared and the loading circle, but that is as far as I got. As I was flying to Dubai and that is where I bought it I took it back to the MacStore there. They said that I would have to reinstall the operating system. After two hours attempting this they sent me away with the discs that I had to borrow from them and said I should do it myself. I flew on to Saudi ad attempted the reinstall there. It failed due to a software error. I attempted the process again, with the erase option, same result. A friend used the install disc utilities menu to check the hard drive when I was informed that the hard drive had failed.
I went to what I thought was an authorised Apple dealer CTS (Computer Technology Services of Jeddah and they replaced the hard drive. It worked for about 2 hours and then froze and refused to restart. The computer was quite hot. Once left to cool it would then restart but not until then, but each time I do this the time it runs is less and less. I have replacement batteries from the recall, so that is not the problem, but I only obtained them after the hard drive replacement.
I do not appear to be able to get any support from Apple as they say the computer is out of warranty - I don't understand why as I bought it in May from what I thought was an authorised retailer in Dubai. I live in Iran and there is virtually no support here, just other ex-pats with Macs.
The other problems that I have is that since the change of hard drive all of my music and programs have been de-authorised. The Mac also seems to corrupt programs I keep having to reload them from my back up LaCie hard drive (which fortunately I did a full back up to just before the thing failed.
I cannot even think where to go for help. I am actually thinking of buying a replacement and attempting to replace the original hard drive into it as what ever the problem was it does not appear to have been fixed by the replacement.
frustrated in Iran

Hi Tim! Sorry that you're having so much trouble with your MBP.
I have not had this issue with my MBP but from your discription it sounds like what happened to my G4 - namely the RAM went bad. I installed 3rd party RAM and it worked OK for a few weeks, then the G4 started to balk at starting, not always but most of the time, then finally I could not get pass the grey screen, it just stopped there.
I contacted a friend of mine and he immediately asked if I had an extra RAM in it and told me to remove it then reboot. That proved to be the solution. I didn't think of it because I thought the RAM would be bad from the get-go not go bad over the course of a month or so. Let me know if this might be your case.

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Hello Everyone,
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Found the problem.
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System freezes and then will not reboot

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