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Wireless keyboard not working at boot/P8Z77V-Deluxe

perseid
Level 7
Hi all, I have a P8Z77V-Deluxe mobo and a Logitech K800 wireless keyboard+mouse. Both are working fine in Windows. Problem is that each time I boot the following issue arises:
- A Megatrends screen comes out saying that keyboard is not present, followed by a prompt to enter the truecrypt password to continue the boot process, of course I cannot type any password as the keyboard was not picked up.
- I then press the front panel reset button to reboot and after doing this the keyboard is recognized and I can go into Windows desktop and work normally.

I plugged the Logitech Unifying receiver in the top USB port (the one recommended to be used for mouse and keyboard).

Of course I did not have this issue with my wired keyboard.

How can I fix this? Thanks.
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