Monitor not turning on for boot menu

[ZuraZura]

I'm trying to reinstall Windows on my PC, and for that I need to access the boot menu so I can set it to boot from my installation disc. The problem is that my monitor shows 'no signal' until Windows is fully booted, giving me no chance to see what's on the boot menu when it is open.

Can anyone help? I just need the monitor to recognise the signal from the tower as soon as the computer turns on.

 

[lonewolf7]

Keep pressing the BIOS key (DEL, F2, etc, its MB independent) as soon as the PC turns on, hopefully you will be able to reach the BIOS, and can change the boot order.