Error: 0271: Real Time Clock Error - Check Date and Time settings.

Hello all,
I have lenovo T430s laptop that is configured with Bitlocker encruptions and TPM PIN entry. I don't think that has anything to do with the error msg I am getting but here it is. Error: 0271: Real Time Clock Error - Check Date and Time settings.
Press Esc to continue or F1 to enter setup. I am unable to get into BIOS or even the login screen for Windows 7.
Any advice would be appreciated.

Thanks to everyone for the help. Just want to close this out. I had a IBM/Lenovo technician here today and he replaced the CMOS battery. Upon the change, the computer is fine being reconnected to the dock (the three times I tried it). So it has been resolved with the battery. Surprised by the incompatibility claim because I am not having issues now. Wondering if it's just a USB 2.0 vs. 3.0 thing (and Lenovo trying to sell more peripherals, of course).
Thanks!

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Can help anyone to resolve my problem.
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Page 85 of the Hardware Maintenance Manual:
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http://www.ebay.com/itm/New-Lenovo-ThinkPad-W500-W510-W520-W530-W700-W701-W701ds-CMOS-RTC-Backup-BAT...
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Error: 0271: Real Time Clock Error - Check Date and Time settings.

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