Monitor not switching on when power up (mobo related)

[wez130]

Hi, i have an old DFI Lanparty NF2 mobo which the daughter is using, however, it's recently not powering the monitor on when i switch it on, i've deducted the GFX card from the equation by tring an old 9800 pro and the Geforce 6600GT that's currently in it.

Any suggestions / ideas?

Thanks.

 

[wez130]

edit:

just tried it again and monitor switched on and pc booted up, then straight away went into standby and won't wake up.