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#31
A few possibilities that have not been checked. Could try fixing any BIOS-related problems:
Note: backup any files if you are using a RAID controller of any kind.
1. Go into your BIOS and load default settings to clear the CMOS memory (this will reset your RAID configuration resulting in loss of data, so if you have RAID and want to proceed from step 3, that is fine).
2. Save Settings and exit the BIOS.
3. Shut down and turn off the computer.
4. Unplug the computer from the wall or surge protector then remove the battery.
5. Hold down the power button for 30 seconds to clear the software connections between the BIOS and hardware and clear any corruption in the temporary memory.
6. Plug the battery back into the laptop and then plug the computer back into the wall.
7. Turn it on to reinitialize the software connections between the BIOS and hardware, and post back your results.