Boot fails sometimes

Hi, everybody

I have installed Mint Linux on my Z83-4U. Works fine for about a day. Now when I turn it on the system seems to "do something'" for a while, then a message comes on my screen saying there is no video signal and then screen is black.
I tried to load Mint with a USB key, it displays the normal Mint flash screen.
I rearranged the boot menu using F3 key and it failed again.
By the way the Setup Prompt Timeout cannot be changed. If I put 2 seconds time out it comes back to 1 on next time I get into the boot menu.



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