Blank BIOS screen in VM for Vsphere 5.1b

I need to boot from ISO in a VM, but I cannot see the BIOS during boot. I can edit the VM and add a delay which delays boot, but I still have a blank screen and cannot see BIOS.  Even if I force boot to BIOS the screen is blank.  However, once Windows begins to boot I see Windows boot.  Any ideas?
vhatoAsked:
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vhatoConnect With a Mentor Author Commented:
Upgrading to ESXi 5.1 1312873 fixed the problem.  Apparently 1157734 has a bug.  Those 3 patches were released on 10-17-2013. Now I can see POST, BIOS, everything for all VMs!  Thanks guys.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you select the BIOS Option to Enter BIOS at VM Start, do you see the BIOS Setup?
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achaldaveCommented:
Try ctrl+alt+insert when you see blank screen, as for boot from ISO make sure the ISO file is on data store and is set to connected, connect on power on.
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vhatoAuthor Commented:
If I choose the BIOS option all I see is a blank screen that sits there requiring a power off, then removing force to BIOS and power on to boot the VM.  But Alas no BIOS

If I press ctrl+alt+insert i see a blank screen that eventually boots to windows. But no bios options or anything allowing me to change boot device.

I am running vSphere Client 5.1 1364039 and ESXi 5.1 1157734

Will Upgrade to ESXi 5.1c and see if that fixes it.
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vhatoAuthor Commented:
Bug in ESX 5.1 1157734 was patched in 1312873
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