Sony VAIO laptop: wrong resolution after mobo replacement

Hi everyone,

I have a Sony VAIO PCG-GRT260G laptop. The motherboard has died
recently, so I replaced with the identical model (MBX-86), identical
revision, identical part number, but from a different model,
PCG-GRT270. Every other laptop component (including the NVidia GeForce
Go 5600 graphic card) is from the PCG-GRT260G (except for the
motherboard).

Everything in the laptop works perfectly fine, except for the display:
Windows XP will not allow the native PCG-GRT260G resolution of
1400x1050, sticking to the PCG-GRT270 1600x1200.

I tried re-flashing the BIOS, installing signed and unsigned Windows XP
drivers for a Viewsonic 1400x1050 LCD monitor, hacking up a custom
monitor .inf file for, using various Windows XP software packages out
there to dynamically change resolution - all to no avail. Windows
XP/NVidia driver will stick to the geometry reported by the
motherboard, and that's it.

Anyone has any ideas? I'm at my wits end and I am getting close to
ripping a perfectly good laptop apart and selling it for parts :).

G.

.

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