BIOS virtualization options greyed out

[tf1231]

Just purchased used HP840 and can not enable VT-x virtualization options under Advanced->System Security in the BIOS, all options there are greyed out with settings as follows : VT-x : disabled, VTd: disabled, TXT: enabled. Without VT-x enabled VirtualBox will not run. I've updated to latest firmware and BIOS versions and reset CMOS with no changes Any guidance on how to enable those options to be modified would be appreciated.

[DGroves]

first set the z840 to factory defaults, remove power cord, press pwr button till beeping stops, open side cover and press cmos reset for 5 sec or remove cmos battery, reassemble and power on enter bios and set any necessary bios options

See the service manual at the link below, chapter 2, page 29 for the location of the enable VT setting.

http://h10032.www1.hp.com/ctg/Manual/c04823811.pdf

System Security Provides these options:
● Virtualization Technology (VTx)—Enables or disables Intel Virtualization
Technology to increase workstation performance.

(Only visible on supported processors)

● Virtualization Technology Directed I/O (VTd)—(Enabled or Disabled) Controls the
underlying processor and chipset features needed to support a virtual appliance.

● Trusted Execution Technology—(Disabled/Enabled) Turns Intel TXT feature on or
off

● OS Management of Embedded Security Device—Enables or disables the ability of
the operating system to control the TPM device, including turning it on and off,
initializing it, and resetting it.

[tf1231]

Thank you for the reply.  I had done that and no change.  I noted that the TPM settings were also greyed out so I decided to reset the security settings via the BIOS.  Doing that resolved the issue and I was able to enable the virtualization options.  I don't have any experience with TPM usage so was hesitant to modify those settings and would have thought that the CMOS reset would have reset them also but apparently not.  Thanks again for the reply.