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Paper Tape
Posts: 4
Registered: ‎03-04-2008
Location: Home
Message 1 of 6 (9,020 Views)

Think Pad T42 Won't boot

If the T42 goes into sleep mode or is turned off, it will not restart.  When the power button is pressed, the power goes on, but the unit rarely boots.  I've taken the battery out and find that if it won't start, unplugging it and plugging it back in often helps the boot process.  I'm pretty sure it isn't the power switch since the power light goes on every time it is pressed.  Any suggestions?
Oh yes, when it does boot, it runs flawlessly.
Retired Moderator
Posts: 70
Registered: ‎11-22-2007
Location: Wisconsin
Message 2 of 6 (9,015 Views)

Re: Think Pad T42 Won't boot

How are you waking the T42 from sleep?  Are you using the FN button?
T61,T42(x2)T41,T40(x2),R40,T30(x2),T23(x3),T21,T20,X20,A31,A21M,600/E/X(multiples of each),770X,i1400(x2),760XL,760ED(x2 w/base),380XD,755CD,750P,360P,365X,560X,701C/CS,730T,PS/Note
What's DOS?
Posts: 1
Registered: ‎05-02-2008
Location: Canada
Message 3 of 6 (8,742 Views)

Re: Think Pad T42 Won't boot

I just had this same problem with my T42.  Turns out the BIOS was partialy corupted.  Booting was extremely difficult, I would have to remove the battery and play with the power cord 10-20 times trying to power it up.  the lights would come on every time however it would not post.  Finally it would post and run normally.  I tried downloading the latest BIOS and it restarted the computer and tried to update.  It then reported that the BIOS information was corupt and would not update.  I then proceeded to reset the bios to the default values and tried the update again.  It worked this time and now the problem is gone.
Hope this helps.
What's DOS?
Posts: 2
Registered: ‎07-15-2008
Location: US
Message 4 of 6 (7,961 Views)

Re: Think Pad T42 Won't boot



I have the same trouble, and I have read a lot about people heating up thier motherboards and reflowing the solder. Many people say that it works. Has anybody else heard of this?


Why doesn't Lenovo replace these boards if they can't handle the stress of regular laptop use?



Posts: 7,626
Registered: ‎11-23-2007
Location: USA
Message 5 of 6 (7,952 Views)

Re: Think Pad T42 Won't boot

Stress of regular use should not include carrying an open laptop with one hand, and that's what killed most of the T4x/R5x machines affected by this syndrome...


Lenovo was replacing motherboards (and still does) for all the units under warranty, which was standard three years for most of the T4x models. IBM also changed the soldering technique and materials on late T42/p units and carried it into the T43/p series which almost never suffer from this problem. This issue was addressed entirely on T60 machines because they don't suffer from this problem whatsoever.


Hope this helps. 



In daily use: R60F, R500F, T61, T410

Collecting dust: T60

Enjoying retirement: A31p, T42p,

Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W

Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.
Paper Tape
Posts: 3
Registered: ‎06-22-2014
Location: United States
Message 6 of 6 (1,146 Views)

Re: Think Pad T42 Won't boot

I have a similar problem.  My T42 goes into sleep mode right away when it is turned on.  No option to boot into BIOS or any other help menu.  


I took out the battery and booted with the power cord only and it works.  I know the battery is fully charged.


Thank you for your help.