Hypervisor not running on Optiplex 755

i acquired optiplex 755 test hyper-v 2008 r2. have biosed a15, enabled vmm in bios still no joy.
have followed instructions in thread here including full power off.
hair getting thin.
event id 51 in system log.
appreciated
sl

hi stuart,

based on finding, processor model not support virtualization

http://processorfinder.intel.com/details.aspx?sspec=sla8y.

can proceed site check if processor model listed in supported intel vt

http://ark.intel.com/vtlist.aspx

best regards,

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laiys

Windows Server  >  Hyper-V