Having problems with your IBM ThinkPad T42 Notebook ?

The AC pwoer keeps on and off (most time off) all the time, however, it still can recharge the battery

\015 The AC power keeps on and off, however, it still charges the battery. The AC Power ICON on and off frequently, the screen keeps flashing.\015

Answers :

The dc jack on your motherboard is loose and needs to be resoldered then. The screen going dim to bright back and forth and not booting up just with the ac adaptor verifies the problem.
This is not a good sign!\015\012
\015\012If all physical connection seems fine, it could mean something is wrong on the power modules of the motherboard! Please try another power adapter to see if it's the power adaptor's fault. If not, get it into lenovo service centre for check-up, as this could damage your laptop motherboard's power modules permanently!\015\012
\015\012This happened exactly what I had on my good old ASUS laptop, I ended up replace the motherboard. Pay little money to get it serviced before you have to replace the whole motherboard!
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