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Have you tried the trick with just the vga cable attached to the laptop and the other end not attached to anything?
Never heard of a null-monitor before so dont know if knocking something up will work as well. I'm guessing its "reading" a voltage change on the vga port indicating its plugged in but it may need grounding to work. Personally I'd grab a 15(?) pin din connector from jaycar (well a couple to experiment), chuck in a resistor on a voltage pin and connect to ground or the shield and see how that goes OR ground all the data lines (leaving voltage alone).
have you tried:
go to Control Panel > All Control Panel Items > Display > Screen Resolution (or right click on the dektop > Screen Resolution) > Advanced Settings > Monitor:
clear the box Hide modes that this monitor cannot display and Apply.
the monitor.inf file tells the os the hardware spec so i guess your lappy doesnt know anything about the new screen, its still reading the old monitor.inf file. (You could set a restore point, backup any monitor.inf files you can find, go to device manager and uninstall the display device. set display to lowest resolution and reboot and see what happens. Every monitor needs to handle the default vga screen of bios so it should work. the display adjusters apply to the primary monitor and when you plug in an external it assumes you are using that, it doesn't know anything about the new internal panel or its specs, gfx chips play no part in this. there may be registry hacks or possibly taking the monitor.inf file from another laptop (more recent) and see how that goes, of course lcd pixels are fixed dimensions so you may or may not have display issues with this.
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