Complete loss of sound

Hi,
Help please!
System: AMD 1.333, K7T266Pro(ms6380)v.1, Win 98SE
Problem: Loss of all sound
History: System worked fine for last 14 months (wasn't I lucky) then video card died. Geoforce 2 replaced by G3Ti200ProVT128. Shortly after sound failed - all sound, not even static hiss or hum. Speakers are OK. Windows reinstalled, HD reformatted, BIOS updated, but still no sound. On attempting to reinstall AC 97 drivers got message, "Audio chipset is not enabled on this system, please enable it first in BIOS, then run this set up again". But BIOS clearly shows "On chip AC 97 audio enabled". Windows wizard will install the drivers and settings-multimedia - devices shows Audio for AC97 Enhanced Audio controller (WDM) enabled and active. Settings-multimedia- devices show drivers for CD audio, midi sequencer and wave audio device as "enabled", but system tools-information-multimedia shows drivers for audio codecs for these three items as disabled :0. Internal wiring looks OK and no loose bits under the MB. What can I try next?

I've same mobo, when i check for new updates on liveupdate the sound stops working...I get it fixed by going to windows volume control and moving the volume level up and down...yeah strange but that's what i've to do every time after checking what's new on liveupdate.

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Find your product number on a notebook:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c00033108
Finding your OS:
http://windows.microsoft.com/en-CA/windows/which-operating-system
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Please click “Accept as Solution ” if you feel my post solved your issue.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
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Complete loss of sound

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