Well just in case you get a hankering to get inside the box (yes always a risk):

Google search string " thinkpad t420 manual pdf "

Link chosen from results: http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t420_t420i_hmm.pdf

Result: very usable full manual on the box.

Procedure for replacement of the CMOS battery (to them the "Backup Battery" p/n(s) 02K7078 04w1642) - it is under the keyboard

http://www.amazon.com/IBM-02K7078-Backup-Battery-ThinkPad/dp/B000COO5VY

http://www.amazon.com/IBM-Lenovo-Thinkpad-CMOS-battery/dp/B004MSS70Q/ref=pd_cp_pc_0

http://www.impactcomputers.com/04w1642.html    (note: most likely accurate for your model but others likely to work)


On Tue, Aug 26, 2014 at 11:14 AM, jd1008 <jd1008@gmail.com> wrote:

On 08/25/2014 11:37 PM, Sudhir Khanger wrote:
On Mon, Aug 25, 2014 at 11:35 PM, jd1008 <jd1008@gmail.com> wrote:
perhaps you will have to accept the consequences :) :)
I think it's more than fan or GPU load issue. There are two reasons.
Firstly, GPUs are not suddenly start eating CPU one day. System has
been running fine for 3 years and months on exactly same setup.
Secondly, if you look into this screenshot[1] I have just booted ON
the laptop and it was already running at 84C. The only thing that was
started was Chrome newtab. You see load is way to high but none of the
processes are taking up too much resources.

[1] http://i.imgur.com/0cBa9eg.png

I would not put it past the google developers to have put in code
in their browser to do things you you are not expecting.
I do not use it.
Also, I asked friends using Apples and Chrome. Some say all is
well, other report different problems.

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