No signal from 7800GT DVi

The following was instructed to me by a DELL technician:
With the pc running I just unplugged the dvi cable from my monitor to perform the lcd's self test, upon plugging the dvi cable back in there was no signal from the pc :S I rebooted and to my delight the windows screen appeared but....then after the boot check and the windows loading screen, the signal drops and the monitor goes into standby :surprised: I have tried another dvi cable and the other dvi output on the gfx card to no avail. It seems that maybe when I unplugged the dvi cable the 7800gt has automaticaly changed a setting but it's strange to give a signal right up to the windows load screen then stop? I haven't tried d-sub yet.

Please help, Rhyth :embarrassed:

OMG! apparently I need the EDID patch from nvidia to re-activate my DVI ports, as unplugging a monitor from your pc will uninstall the DVI drivers! wtf,

Thats drivel.

Boot in safe mode, i bet something appears, at which point you need to check your resolution and refresh rates, i bet one of them is set too high for your tft (60hz, and whatever res is). DVI doesnt require drivers, its an output mode, i unplug my monitor with the machine on loads.

You alsow want to check in the advanced timing section of the display properties to make sure everything looks right

Ok will do. I'll try the dsub connection too.

Ok I can't get into safe mode, doh! F8 isnt doing the trick or if it is I cant see anything :confused: I dont understand why it shows the boot screen right up to the windows login....Ahrrrg Dell say its a wekll known issue with nvidia cards...well youd think they would ask what gfx card you had before telling you to unplug your monitor!

Does dsub work? Have you got a crt monitor you can try?

Ok so it was dell freaking me out with all that edid patch crap! Last known setting that worked did the trick, thanks Herulach. I feel stupid....what did I learn today? Dont listen to dellboys on the phone.

hey rolly glad ya got it sorted remember its F5 to whilst ya pc is booting to knock it into windows advanced boot menu

Cheers Cougs