I have an HP Pavilion ze4540ca notebook. Last month an online bios update failed. The notebook would not power up. After reading many posts of others with the same problem (yes I won't update my bios again) I ordered a replacement bios. I had the bios installed today and now it powers on and off continuously every few seconds and can only be turned off with the reset button or pulling the battery or cord. It won't boot from a floppy boot disk. Any ideas whats happening here and is the password in the original bios maybe required for startup? Maybe the original bios needs to be reprogramed as the password would still be there! Any help is appreciated. An added note for others to beware!! My ze4540ca (similar to Compaq 2100) , according to HP has a motherboard part # 319612-001 which has an AMD CPU. (Wrong)!! My notebook motherboard # is 319449-001 with a Intel 2.4 CPU. Check part under DRAM chip bottom of notebook. Are we getting BIOS updated with wrong code online?? I'm checking further.