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It's possible something besides HL2 is forcing the sync out of bounds when you launch HL2. Do you have any resolution/sync assistant software running? Check your Notification Area. Something like Multires? (Shipped with Omegadrivers, but numerous others have similar function.) If you find anything with resolution/color/sync options quit it and try HL2 again with the -autodetect option.
Barring anything like above, the shotgun approach would be to uninstall again and make sure you clean out everything. Be sure to uninstall Steam as well as HL2. Run regedit. Search for:
HKEY_CURRENT_USER\Software\Valve ...
If it's still there after the uninstall, delete the entire Valve tree. Reinstall.
If it doesn't work then I'd go the route others here have suggested and explore using other monitors temporarily to get things working.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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