E220s freezing without symptoms after renewing fan and thermal pad

Hello fellow Lenovians,
I recently renewed a rattling fan in my E220s. Since then I get permanent freezes every time, starting from ca. 5 to 40 minutes on. I checked with Sandra, and to my understanding no temperature sensor shows anything abnormal.
Since the thermal pad on the chip to the left from the CPU (northbridge?) seemed worn, I renewed it also with a 1 mm 7W pad. After dismantling again it does seem not the whole (but no less than 80%) of the chip's surface is hard pressed to the pad. I understand it's all the screws that keep the structure tight, but I have no more ideas on how it can be wrongly fit - or improved. Please note I have dismantled the laptop including the fan assembly several times before, without any noticeable issues. Yes I do use thermal grease/spread for the CPU.
Many thanks in advance,

bump.

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Welcome to Apple Discussions!
Has your keyboard and mouse quit working altogether or just when the computer is hot? And do I understand that an external keyboard and mouse will work with no problems?
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Another thing to do to check when your Mac is unusually hot is the Activity Monitor. Select "All Processes" at the top right and check for any process running that should not be which is using lots of CPU.
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On our FIM 2010 R2 environment (version 4.1.3599.0), after renewing the certificates used on FIM Service/Portal and Password Reset/Registration servers two days back, both the password registration and reset no longer work but instead fails on the last
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