MCE, it seems to be a boot compatibility with the operating system installed on the USB. I don’t think your motherboard is defective, since you were able to install other operating systems such as Ubuntu or DOS as you mentioned on your post.
Please keep in mind that ESXi 5.5 is an OS for server systems.
Thank for reply.
I am aware it's not a server board, but for small home server I don't need
specialized expensive proffesional server grade hardware.
For my purposes this intel board is sufficient and i like
management features it provides.
Until I give up and replace it with board from another manufacturer,
will try everything to make it work as one would expect.
I agree that my board is not defective, as it can boot vmware from USB stick
with no problem when selected from boot device list (F10 at startup).
Only automatic boot doesn't work...
Now when I want to boot (and run) vmware from USB stick, manual intervention
at computer startup is necessary.
I did another test:
I took usb stick with vmware which can't boot (automaticaly) on DQ87PG board,
plugged into my another box (used as NAS) based on GIGABYTE board with the same chipset (q87).
System booted flawlessly on first try. Repated several times, no problems at all.
That's why I am convinced it's an bios issue of DQ87PG board.
Is there any chance that intel bios development team will check (and if possible, fix) this issue ?