[need troubleshooting] soft-15kHz + mid res arcade monitor

[Qwintin]

i've a CRT arcade monitor, a nanao 27'', that can be set to display in low or mid res. My computer is connected to it through a JPAC. I've tried soft-15kHz and it's working like a charm in 15kHz: my arcade monitor displays the computer image without flickering or whatever.

Fine.

But as the arcade monitor can display 24kHz too, i think that it may be interesting to use soft-15kHz to output my computer's image at mid res (to display my frontend in a higher res). So here's what i made:
*run again soft-15kHz, uninstall 15kHz and install 25kHz
*switch the desktop resolution to 512x384
*switch off the computer
*manually switch my arcade monitor to 24kHz
*move the jumper on the JPAC to allow 25kHz and 31kHz
*start the computer again and observe: it doesn't work.

I don't know what's happening. I don't know if the fact that the arcade monitor shows '24kHz' and not 25kHz is meaningful or if it's identical. It seems that the soft-15kHz is doing correctly his job as my computer's image cannot be displayed anymore on my pc screen after i installed 25kHz (it says 'signal out of range')... though, i don't know if one graphic card could work flawlessly for 15kHz and not at all for 25kHz.

Does anyone of you have any idea on what i could do? Am i missing something? Since it already works in 15kHz, this is not really problematic but if i don't try anything i can do to see the result in 25kHz, i'll keep in mind that, maybe, it would have been better in mid res.... i need to test

Thanks for your help


edit: ho yes, my graphic card is a leadtek winfast A6600 and it's using the nvidia driver Forceware 77.77... if it makes any difference

[iori01]

Hi

I just think that your monitor is not an auto-switch.

If you want to display 24Khz picture, you have to switch to this mode.

[Qwintin]

I just think that your monitor is not an auto-switch.

If you want to display 24Khz picture, you have to switch to this mode.

yes, i think the same... that's why it was written down in my manip, above 

*...
*manually switch my arcade monitor to 24kHz
*...