Lenovo T61 randomly, suddenly stops

Hi Guys,
 I am using lenovo t61 laptop which I bought in year 2007, It started shutting down suddenly when I am using it without any error message. I thought its because of heating issues and changed the cpu fan, even though it did not fix the issues. Please let me know If someone had already faced this issue and there is a FIX.

when you say stops can you elaborate on this? i.e. there is an error message that pops up or if the system shutsdown without warning?
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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