HP dx6120 HP Business Desktop dx6100 Series Personal Computers Service Referen - Page 198
Run Computer Setup. If Setup already, Run Computer Setup and Diagnostic - parity check 2
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POST Error Messages Screen Message 2000-Master Boot Record Hard Drive has Changed. Invalid Electronic Serial Number. Probable Cause The current bootable hard drive is not the same as the one that was present when MBR security was enabled. Electronic serial number has become corrupted. Network Server Mode Active and No Keyboard Attached Keyboard failure while Network Server Mode enabled. Parity Check 2. Parity RAM failure. Recommended Action Run Computer Setup and either disable MBR security or save the MBR of the current bootable disk. Run Computer Setup. If Setup already has data in the field or will not allow the serial number to be entered, download from http://www.hp.com and run SP5572.EXE (SNZERO.EXE). Run Computer Setup and try to enter serial number under Security, System ID, then save changes. Reconnect keyboard with computer turned off. Check connector for bent or missing pins. Ensure that none of the keys are depressed. Replace keyboard. Run Computer Setup and Diagnostic utilities. C-6 361293-003 Service Reference Guide, dx6100