It has been my experience that once your BIOS chip has failed, there aren't many options other than contact the manufacturer. Not sure about your model, but it will probably necessitate a motherboard replacement... I could be wrong though...anyone else? Jacob Wahlman -----Original Message----- From: PCSOFT - Personal Computer software discussion list [mailto:[log in to unmask]] On Behalf Of Richard Burris Sent: Thursday, February 03, 2005 12:05 PM To: [log in to unmask] Subject: [PCSOFT] cmos I have a Toshiba 440cdx Satellite Pro, that on boot up says: *** bad check sum (cmos) *** check system then press {f1} I can't get it to do anything, I have tried using a boot disk with the bios downloaded from toshiba but still can't get by the first screen. How do I get it to boot to the bios Screen or any screen from where it is now? The NOSPIN Group Promotions is now offering Mandrake Linux or Red Hat Linux CD sets along with the OpenOffice CD... at a great price!!! http://freepctech.com/goodies/promotions.shtml PCSOFT's List Owner's: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>