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Lots of issues with 0176 error. Could be caused by a dead cmos battery or the system thinks it has been tampered with. I found a couple of clues for you;
The T41 Hardware Maintenance Manual gives the following instructions in case of error 0176:
"Run BIOS setup utility, and save the current settings by pressing F10."
To get into BIOS, you need to press the F1 key when you see the splash screen. I suppost that the splash screen on a T41 will display a ThinkPad or IBM logo, and something similar to "to interrupt normal start procedure, press the blue thinkvantage button".
The idea that a new motherboard might be necessary comes from the T41 Hardware Maintenance Manual. It says that in case the first instruction, i.e. get into BIOS and save current settings, doesn't fix the problem, a new motherboard should be installed.
You could try the following:
Disconnect the AC adapter from the notebook, disconnect all other cables. Remove the battery pack. Press the power button ten times in one-second intervals. Then press the power button again, and hold it pressed down for 30 seconds. Then install the battery pack again, connect the AC adapter. Press the power button.
Re: 0176 Security - The system has been tampered with
The padlock came up after removing the BIOS-battery. It is a security-feature and cannot be bypassed.
Removing the BIOS battery does not remove the supervisor-password but locks the system, if one hat been set to protect the computer from illegal use.
So either try to get the SVP from the previous owner ore replace the board.
Okay friend so you are in front of real problem now, bypass of BIOS pass system is not impossible but really really hard.... In order to do this you must follow next really detailed instruction, check this link:
T30- no sound altho SOUND MAX drivers installed...
Try Control Panel, Sounds, Sounds (tab), choose a sound toward bottom of list. press the BLACK PLAY ARROW...if BLACK SQUARE appears at the arrow, your sound is installed $\& probably OK...
NOW,,,insert a musiv CD. then press the VOLUME BUTTON, (2nd one over from the THINKPAD button, & you should get sound aplenty !!
i have the same problem. actually its a common problem for many T21 and other old IBM laptops.
i searched that you have to take all power (batery, adaptor)
press the power 10 times and press it for 30 secs then reinsert the battery or adaptor and try to power it on.
they say its done to discharge a certain capacitor that got overcharged after overcharging the battery.
that worked for me before but now my T21 wont start any more with this process.