Something kinda similar happens to my Xenarc, but at a later stage. I have managed to figure out what happens but not why it happens. It seems that when i try the standby on my CPC and the system then kills power due to a low battery current, then the next time it powers on the display gets blank.
Looking at the BIOS the type of screen attached gets changed from CRT to LCD (It works in the CRT setting but not in the LCD setting). When i change it back to CRT it starts working just fine. Now i have started shutting down my system instead of trying to make it standby (which doesnt work anyway). When it shuts down and reboots it works great every time.
Maybe you should look at the screen setting in your bios.