I have a system with an ATI 4870 hooked up to a Samsung P2350 using DVI. My motherboard is a GA-EP45 DS4P with the latest BIOS.

The situation is:

I turn on my PC (with the power switch)
I get a blank screen
I hit reset and the PC boots up normally, i.e. the monitor turns on and 

This has been the case for a couple of months (Was away for a while, came back and it was the same case). I was hoping the situation would somehow fix itself but alas, nothing.

I have tried numerous settings in the BIOS (Combinations of different settings of the ACPI and power saving options) and have tried different cables.

Has anyone experienced this before? I don't know where to go from here. It is pretty infuriating because it means I can't put my computer to sleep, as the monitor won't come on.

Any help is appreciated.

Thanks