Compaq D51s Troubleshooting Guide - Page 62

Post Error Messages Numeric Codes and Text Messages Code/Message 1801 Beeps None 1998-Master Boot Record has been lost. 1999-Master Boot Record has changed. 1L, 2S* 1L* Probable Cause Processor is not supported by ROM BIOS. The previously saved copy of the MBR has been corrupted. The current MBR does not match the previously saved copy of the MBR. 2000-Master Boot Record Hard Drive has changed. 1L, 2S* *L = Long, S = Short The current bootable hard drive is not the same as the one that was present when MBR Security was enabled. Recommended Action Upgrade BIOS to proper version. Run Computer Setup and save the MBR of the current bootable disk. Use extreme caution. The MBR may have been updated due to normal disk maintenance activities (disk manager, fdisk, or format). Replacing the previously saved MBR in such situations can cause data loss. If you are certain the MBR change is unintentional and undesired (e.g. due to a virus), then run Computer Setup and restore the previously saved MBR copy. Otherwise, run Computer Setup and either disabled MBR security or save the MBR of the current bootable disk. Run Computer Setup and either disable MBR security or save the MBR of the current bootable disk. A-12 Troubleshooting Guide