Question about Toshiba Satellite M45-S169 Notebook

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My Toshiba Satellite M45-169 keeps freezing

Can anyone tell me what these messages that I receive on startup mean:

"System CMOS Checksum bad-Default configuation used"

"System BIOS Shadowed"

"Video BIOS Shadowed"

My computer was working fine; then one day...Bamm; it keeps freezing up on me....I can't always boot up when I want to. When I do boot up and it's working, everything is fine, then I click on something and she freezes up. I used my original disc to put a whole new XP operation system on it....I cleaned off the heat sink.....I've run the Toshiba diagnostics program and everything passes....then Bamm, she freezes up.

Any ideas would be much appreciated.

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  • Anonymous Mar 29, 2014

    it is also always bringing up unresponsive script and flash player are not responding i am assuming that they are all linked somehow .Anyone got an idea

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  • Toshiba Master
  • 1,314 Answers

1. The battery on the motherboard has died. Replace battery.
2. The BIOS is corrupt, reflash BIOS.

Most likely #1, very rarely #2. Pop out the battery on the motherboard and replace it, after the first time you boot up your computer, go into BIOS and set everything the way it should be for your computer (usually just time and date) and then after each sequential time you reboot, that should take care of your problem.

Posted on Jun 24, 2008

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Posted on Jan 02, 2017

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Dell Inspiron 530. At start up gives CMOS checksum error defaults loaded. Options press F1, F2 or F12 computer does not react. Has new CMOS battery. RAM OK. Did CMOS clear and password reset. What else can...


When a Power Supply is plugged into power, there is a constant 5 Volts present. The 5 Volt Standby Power.

You press the Power On button.
This in turn presses against the Power On switch, located inside it's plastic assembly.

The Power On switch is a Momentary Contact Switch.
Temporary closing it activates the Soft Power On circuit.
A 5 Volt circuit that utilizes the 5 Volt Standby Power.

The Soft Power On circuit 'excites' the Power Supply, and turns it on.
(Sounds like a seedy novel)

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The Basic Input/Output System program is initialized.

BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.

A checksum is computed as an error-detecting code, to protect the BIOS settings stored in CMOS.
Each time the computer is turned on, this number is re-computed; and checked against stored values.

If they do not match an error message is generated, to tell you the CMOS memory contents may have been corrupted; and therefore some settings may be wrong.
Your BIOS assumed the settings were incorrect, and loaded BIOS default settings; stored in BIOS.

(Default = factory settings)

CMOS Checksum Error Defaults - Loaded

New battery? Nope didn't help.
Clear CMOS, and password reset? Nope didn't help.

Leaves Virus as the problem, or hardware component/s on motherboard; are bad.

My thoughts?
Bad motherboard.

("BAD motherboard. NO,...........you know you have been bad,....don't give me that look. You're a bad motherboard."

Lol!)

That's my diagnosis.


(Unless you put the CMOS battery in upside down.
+ goes UP)

Regards,
joecoolvette

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I want to restore my Toshiba Satellite Pro to factory Settings, and I don't have the recovery CD.... The specs: A105 Processor: Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz Memory (RAM) 32-bit Operating System...


Set BIOS defaults
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    **** Bad Checksum (CMOS) ****
    Check system, then press [F1] key
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If you need more help come back.Post / thumbs / testimonial are welcome!

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1 Answer

Cmos checksum error & keyboard not function


CMOS checksum errors
Explanation: A checksum is computed as an error-detecting code, to protect the BIOS settings stored in the CMOS memory. Each time the system is booted this number is recomputed and checked against the stored value. If they do not match, an error message is generated to tell you that the CMOS memory contents may have been corrupted and therefore some settings may be wrong. BIOSes react in different ways to encountering this sort of error. Some will warn the user and then continue on with whatever settings were in the CMOS. Others will assume that the settings that were in the CMOS were corrupted and will load default values stored in the BIOS chip "for safety reasons". The error message will indicate which your system is doing.
Diagnosis: The most common cause of checksum errors in CMOS is a battery that is losing power. Viruses can also affect CMOS settings, and motherboard problems can also affect the stored values.
Recommendation: Follow the instructions in this section to address the CMOS corruption. You should make sure that all of the BIOS settings in the system are correct, by rebooting the system, going into BIOS setup and double-checking all the values (hopefully against a recent BIOS settings backup).

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from any pc shop or ebay...

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