I have a HP laptop dv2637tx. Because I had installed many types of OS, my laptop did not work with F11 when I tried to come back the factory defaults. I tried to make the recovery partition as Active by following this help http://vinhboy.com/blog/2008/02/26/hp-compaq-recovery-manager-f11/ but this did not work because when I restarted, it said: “NTLDR missing Press Ctrl+Alot+Del to restart”. Finally, what I did was:
(1) Install new Windows Vista if you don't start up your system.
(2) Download and update the WinFlash for HP Notebook System BIOS from http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-67384-1&lc=en&dlc=en&cc=us&lang=en&os=2100&product=3593147
(3) Restart the system, keep pressing F11, on the menu options --> choose RAMDisk devices options
(4) Follow the instructions to restore your system back to original one.
Good luck!
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