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Three weeks ago, I disassembled my notebook to clean its heat sink. I re-applied thermal paste and re-assembled it. It worked well, until about three weeks when it hard shut down while I was working with it. When I tried to turn it on again, it only got as far as the desktop before shutting off. After a day, the power button did nothing at all.

Service said that there was a problem with the video card being unsoldered and soldered a new one in, but it has stopped booting again. Now I think that I may have applied applied more thermal compound than usual and that it somehow damaged my CPU or video card.

What did I do wrong?

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I wouldn't believe much "service" says... – MDT Guy Jun 13 '13 at 12:49
I had no alternative, as I'm not good at these things unfortunately – Javidan Jun 13 '13 at 12:54

Is it silver-based thermal paste? If so, its not particularly conductive to electricity, but it does have some capacitance. If it is in contact with any of the connections on the CPU, motherboard, RAM, or video card, it could potentially cause the problems you are encountering. It can essentially slow down data flow, which can generate errors causing the system to shut down, particularly if it gets on the RAM.

If there is any extra anywhere in your system, it would be a good idea to try to remove it carefully.

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no its white-based paste. No it RAM is in background of motherboard. I will disassemble it and clean anyway. But main question for me is, why it worked 3 weeks, then stopped? then problem is other thing? – Javidan Jun 13 '13 at 12:45
And if now, laptop doesn't boot up, it means that motherboard is damaged? – Javidan Jun 13 '13 at 12:46
We're talking about the element silver, not the color. I don't know what "white-based" paste is. – WindowsEscapist Jun 13 '13 at 12:49
@Javidan It's not the colour that's relevant; its the content. If the paste is white, it is less likely to contain silver, but it is still possible. It's difficult to say exactly whether any components are damaged just from this. The only way to tell is for you to clean any contaminated components and see whether it boots up. It is possible for thermal paste to cause intermittent problems, like the ones you have experienced. – Wolves Jun 13 '13 at 12:51
@Wolves - I would agree. I was just making sure. You mention the possible conductive properties of the paste so it sounded like you were warning against silver based thermal paste. – Ramhound Jun 13 '13 at 13:50

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