Macbook keeps shutting down after replacing the screen!

Hi,
The screen of my four year old Macbook cracked the other day and, after being quoted around £500 from Apple to replace it, I decided it was pointless seeing as though the machine cost £700 nearly four years ago.
A friend of mine ordered a screen and replaced it for me. I've just turned it on for the first time an hour ago and the screen and everything else works, but for whatever reason the machine just turns itself every now and then. Does anyone have any idea why?
I assume it must have something to do with how much of the processor is being used because I have done a little testing and have found that, when the machine is hard at work, it switches off after about ten minutes, while after 45 minutes of being idle, the thing has stayed on when I haven't touched it (typing this from a different machine).
So I'm just wondering if anyone can help me diagnose the problem, and better still, help me resolve the issue. I know taking the Mac to the Apple store would have been the safest solution but surely you can understand my unwillingness to do so considering the machine is worth less than the price to fix it.
Many, many thanks in advance for any help.
Additional info:
The Apple logo at the back of the screen is very dim compared to normal.

Have you tried a different charger?
Hardware fault, very likely logic board. 
Make a service call to Apple for diagnostic / repair at your local Apple store.

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