Logic board or screen problem?
I have an old MBP, which I decided to try and get working again. For some reason which I can't remember now I originally came to the conclusion that it was the logic board which was faulty. But now I'm beginning to wonder if it is the onboard screen.
When I start the machine it works well for a while - a variable period something less than two hours. Then it either reboots (this usually happens fairly quickly after starting) or the machine hangs. I cannot use any keys, nor the mouse, the cursor does not move, I cannot connect to the machine from another. The only recourse is to hold down the power button until the machine stops, then start it again.
I have been experimenting a little today, and I managed once to have the machine running from an external monitor with the onboard screen turned off. I only managed this once probably because I was then connecting the external monitor directly to the MBP (Now I have it connected via a KVM switch). However the machine appeared to work fine for somewhere around the two hour mark and then I discovered that it had rebooted, and was now showing the desktop on both screens. Since then I have not been able to get the machine to run with the onboard screen turned off.
Based on the above info, can anyone give me the probability that the problem is the logic board and built-in graphics card or whether it is more likely to be the onboard screen which is causing the problem.
Thanks in advance.
Is this a good question?