Question about IBM ThinkPad T21 Notebook

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ERROR CODE I got this error message when I startup my laptop 0175:Bad CRC1,stop POST task. then press F1 to enter SETUP press F12 to choose temporary doot devive. at this stage then nonthing happens

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I have tried this, open the notebook from back and remove the CMOS battery and leave it for 12 hours, then boot the system and shutdown immediately and put CMOS battery on its place, then boot the system Junaid Pakistan

Posted on Feb 23, 2007

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It sounds like your computer can?t read the boot sector on your hard drive which it needs to start up. The most likely cause is mechanical wear which usually starts gradually and gets worse over time. The computer ?system? can generally overcome these read errors through a series of read retries at first but as the problem progresses it becomes more difficult. When this retrying becomes more common users typically notice their computer making a ?clicking? noise. Mechanical hard drives failures not uncommon on laptops where power settings have the hard drive shut off after 5 or 10 minutes of inactivity. This is done to increase battery run-time; unfortunately this puts a lot of stress on the hard drive. My default settings for all my laptops is to not allow spin down (shutdown) while on A/C power and when on battery only to spindown after 30 minutes of inactivity. I would go into your BIOS setup (F1) and verify your hard drive is still defined and as long as you?re there take a look to make sure the date and time are still set correctly. If everything looks OK quit out of the BIOS, shut down and restart your laptop, several times if necessary. If you are lucky and this is the beginning of the read error cycle then eventually you will be able to start your PC. If you are successful immediately backup your data, collect up your restore CDs and install a new hard drive. If you have any other questions let us know what additional info you have. As always please don?t forget to rate this post.

Posted on Jan 31, 2007


Unfortunately this is not a Hard Drive issue. When the Laptop displays "0175:Bad CRC1,stop POST task" The PC just freezes and does not let you go anywhere else, neither the Bios or Setup. IBM's only solution is to replace the Mother Board. There are other solutions is you google it but all of which require an investment of between $70-100. All in all it is much better to just replace the board which can be found on eBay from anywhere between $30 to $70. Hope this helps and Good Luck!!

Posted on Feb 09, 2007

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Error 0175 bad crc1

Numeric error codes - ThinkPad General From IBM Web Site
· The most likely cause is listed first.
· A numeric error is displayed for each error detected in POST or system operation.
· In the displays, n can be any number

Error code
Symptom or error

Field replaceable unit or action, in sequence

Bad CRC1, stop POST task. The EEPROM checksum is not correct

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1st Keep on rebooting your laptop until this error goes away.
2nd Replace the BIOS battery, it maybe nearly worn out. After replacement you need to go into the BIOS setting to set the Date & Time.
System board

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It appears that your BIOS battery is nearlt flat and needs replacing.
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sounds like cmos battery flat small battery inside pc to retain cmos setting when pc switched off

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