ThinkPad R50 1830EM4 Sqealing, High Pitch Noise after installing Video Drivers

Hi all,
I Have a ThinkPad R50 1830-EM4. I recently replaced my motherboard due to it being faulty. I replaced it with a motherboard from a ThinkPad R50 1829-6DM. It is working fine, but every time I move/maximise/minimise windows, in XP, it makes a High Pitch Sqealing noise (strange noise like a rapid series of very short high pitch noises adding to a constant kind of whistling - only as long as the movement goes and the screen is on). What could be causing this noise?? It is quite annoying and I would like to get rid of it.
The noise starts as soon as I install the Video Drivers
I have tried tried installing the Omega drivers - no luck,
Also I reduced the noise a bit by disabling Hardware Acceleration,

Any help would be appreciated: I am also willing to answer any questions

my specs;
IBM/Lenovo ThinkPad R50 1830-EM4: P M 1.5GHz, 2GB RAM, 120GB HDD, 14.1 XGA(1024x768) TFT LCD, 32MB ATI Radeon 7500, 24x24x24x/8x CD-RW/DVD, Intel 802.11b wireless(MPCI), Modem(CDC), 1Gb Ethernet(LOM), UltraNav, Secure Chip, IEEE 1394, USB FDD, 6c Li-Ion, Windows XP Pro OEM

Thanks,

Dean.S

IBM/Lenovo ThinkPad R50 1830-EM4: P M 1.5GHz, 2GB RAM, 120GB HDD, 14.1 XGA(1024x768) TFT LCD, 32MB ATI Radeon 7500, 24x24x24x/8x CD-RW/DVD, Intel 802.11b wireless(MPCI), Modem(CDC), 1Gb Ethernet(LOM), UltraNav, Secure Chip, IEEE 1394, USB FDD, 6c Li-Ion, Windows XP Pro OEM
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Lenovo 3000 N200 0687-A11: T5450(1.66GHz), 2GB RAM, 120GB 5400rpm HD, 14.1in 1280x800, Intel X3100, CDRW/DVDRW, Intel 802.11agn, Bluetooth, Modem, 10/100 Ethernet, Fingerprint reader, Camera, 6c Li-Ion, Dual Boot Windows XP Pro OEM & Windows 7 RC