No sync with Asus/ATI Post screen.

[Andypc]

I have an ATI HD 4670 running in my arcade machine with a Wei-ya Tri Sync arcade monitor. My only problem is that the initial post screen does not sync. The XP boot screen is fine and I have no problem with the resolution once windows has loaded, but I am concerned that the ATI post screen my be at a resolution to high for the monitor. I know it is only brief, but is there a way to force it to 640 x 480 60Hz. I would have thought that it shouls have been this resolution anyway?

[lilshawn]

it's syncing, it's just not able to support that resoulution.

perhaps your BIOS has a show boot options or disable full screen logo.

many of our big buck hunters run tri sync monitors and show garbled boot screens with no ill effects.

[Andypc]

it's syncing, it's just not able to support that resoulution.

perhaps your BIOS has a show boot options or disable full screen logo.

many of our big buck hunters run tri sync monitors and show garbled boot screens with no ill effects.

The fact it's not syncing means its putting out a resolution higher than 640 x 480 @ 60hz. The post screen does not display a full screen logo. The motherboard is a Asus P5Q-VM. Does anyone know what resolution the post screen is output at or how to change it to VGA?

[Andypc]

Problem solved. It was the Marvell IDE controller post screen that was causing the problem and displaying a resolution that was to high. Fortunately I was not using it and have now disabled it in the bios.

[MonMotha]

A lot of BIOS startup screens (and yes, it will vary with screen if you have any add-on BIOS helpers like from "RAID" controllers) run at ~640x400 @ 70Hz.  This still works out to ~31kHz, but the refresh rate is higher than the standard/more common 60Hz, and a lot of arcade monitors will be unhappy with that.  PC monitors are all designed to handle it, though.