Help - My machine won't boot and I cannot get into the BIOS - 990FXA-GD65

I have been trying to install an AHCI driver for use by WinXP, so far with no success (see this link: https://forum-en.msi.com/index.php?topic=161637.0 )
However, following my last unsuccessful attempt, I had to take a break from running any more attempts and switched off the machine for several days.
I have come back to it tonight and I find that the machine won't boot at all and that pressing DEL or F11 after starting won't take me to the BIOS or the boot menu. The display shows nothing, other than 'No HDMI signal'
Are there any tests I can do to establish what might be wrong?
pbb

Thankfully the machine has come back.
I tried a couple of cmos/battery clears, with no success.
Then I took out one stick of memory, cleared the cmos and it all worked on rebooting!
I put back the memory slug, cleared cmos again and it continues to work!!
What a relief - thanks xmad.

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