Question about Toshiba Satellite A100-S8111TD Notebook

1 Answer

0251: System CMOS checksum bad-Whats this? ToshibaA105-S4254

Dear All,
I have a 2 yr old Toshiba A105-S4254.No software problems so far (except for the power chord problem, now solved, which is pasted below). But,today For the fist time when I turn the power switch on I get a black screen and I get this message (among other things that are written):

0251: System CMOS checksum bad- Default configuration usedPress to load default to set up"

I have no idea what this is. Which of the two F1 or F2 should I press?
Thanks in advance,
PS: I have pasted the old probem which got solved last week below just in case it is related to this current one. Thanks

PREVIOUS PROBLEM that got magically solved on its own is given below:

Dear All,

Ironically, 5 days after the paid warrenty expired (2 years and 5 days after I bought this piece of equipment), the A105-4254, it suddenly died on me!

It always had a "loose connection" to the AC adaptor. While working at home, I always had to pull and yank the power cable everytime I used it to make sure the "blue power light is on" and that power is being supplied to my laptop or else it would indicate that it is being powered through the battery instead.I lived with it. However around Christmas, when it was the season to be Jolly, the power cable connection started acting up big time and I perpetually had to hold the powersupply cable connection to the laptop with my left hand and type using only one hand. This went on for a few days. And then, on January 17 2009, my laptop just died on me. Like dead dead.I bought a new powercord ($150)- nothing. I removed the battery and plugged in the AC adapter-nothing. No lights, no sounds, nothing. I cannot live without my laptop. Help.

Please give some suggestion which do not include paying an arm and a leg to get it repaired (it is outside the warrenty remember).
Thanks to all in advance,

Posted by on

  • shr8002 Jan 28, 2009

    Thanks DJSam. I will press F1 as you recommended.

    What exactly is CMOS?

    And I didn't do anything to my laptop in ternms of software, so then how did the "checksum" become "bad"? In other words, what could I have done to cause this? I only use my computer (toshipa laptop) to surf the internet and check emails etc.

    Thanks again,



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 32 Answers

You can go ahead and press F1. If it happens again the next time you boot up or it just goes back to that screen try pressing F2 and then exit with saving.

This should solve your problems, If it doesnt you have something configured incorrectly in the CMOS.

If this is the case there should be somewhere that you can restore the defaults of the CMOS (as every computer is different I can't guide you through this process)

Have a great day.

Posted on Jan 28, 2009

  • djsam112 Jan 28, 2009

    CMOS - complementary metal-oxide semiconductor

    It is the chip that holds all of the information for the BIOS.

    It is basically the base workings of the computer on how it runs all the hardware.

    I apologise for neglecting to state this in my last response but if it keeps happening this could be due to your internal battery (looks almost like a watch battery) going dead.

    Another thing that can cause this is a faulty BIOS install or a program that changes settings in your BIOS. As updating the BIOS can be a risky procedure i would recomend getting someone confident in this to do it for you. (Do this only if it is the problem)

    So again if this keeps happening it is most likely the internal battery that powers the CMOS chip as you have already stated that it is most likely not due to software.



2 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 1124 Answers

SOURCE: A105-S4254 is dead!

According of your description, If you already changed the power suply, and the battery, and still no signs to power on, your laptop has some issue at power connector in the motherboard and need to be serviced.

Posted on Jan 24, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How to access toshiba a105-s4254 cooling fan

This site will answer your question as the person writing it had the same problem.

Toshiba Satellite A105 Laptop Disassembly Guide Cooling Fan Heatsink...

Sep 08, 2014 | Computers & Internet

1 Answer

Need drivers downloads for toshiba satellite a105-s4254 laptop xp pro 32-bit

Here is the link to the Toshiba support page for your computer. At the bottom of the page, there is a link to the Windows XP specific drivers.

Satellite A105 S4254 Support Toshiba

Aug 25, 2014 | Toshiba Satellite Computers & Internet

1 Answer

Download driver toshiba a105-s4254

The link to your laptop's download page supplied by Toshiba is listed below. If you found this information helpful, please remember to leave positive feedback.

Thank You,


Mar 20, 2011 | Toshiba Satellite A105-S4254 Notebook

1 Answer

Hi, I have a Toshiba Satellite A105-S4254 when I boot the laptop it goes to the windows xp screen, after that right before the starting up screen, it goes to a blank black screen with the mouse cursor, but...

try restoring this unit to an earlier time
in restore function is a calandar check which things were updated last time

go to start
all programs
system tools

heres the restore function

Apr 18, 2010 | Toshiba Satellite A105-S4254 Notebook

1 Answer

Hi, i just bought and installed a new lcd on a satellite A105-S4254; the display comes up but i don't see one big desktop, i see 4 mini-desktops on the screen. the intel 945 gm drivers are up to...

thats because u need to go to graphics options and change it there depending on the type of windows if u have windows vista i can help u but if not im sorry but i dont know.

Dec 19, 2009 | Toshiba Satellite A105-S4254 Notebook

1 Answer

Toshiba Satellite A105 s4254 Wont Boot Recovery Disk

You most likely have a bad hard drive. I would replace the hard drive and run a recover disk to put your laptop back to it factory condition. if you don't have a recovery disk you can get one at one of the sites below.

Feb 17, 2009 | Toshiba Satellite A105 Notebook

1 Answer

Need instal camera logitech need software

If you are using winxp so problem or else type in drivers for logitech and the model no. on and voila! you get the drivers,

Oct 03, 2008 | Logitech Webcam

1 Answer

Toshiba A105-S4254

Probably its the inverter.

May 12, 2008 | Toshiba Satellite A105 Notebook

Not finding what you are looking for?
Toshiba Satellite A100-S8111TD Notebook Logo

2,670 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18415 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

Are you a Toshiba Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides