:majorI have read previous sim. threads, not sure if they apply to my problem. I have had many problems. All starts w/ fried mobo !!!!!!!!!!!!!!! 5yr old system. New mobo: ASrock Intel Pen 4, ConRoe 1333-D667 (package) w/intergral sound; REALTEK HD AUDIO 188.8.131.52 ?? Driver R 1.47. Original start up everything OK; sound work fine. Had installed everthing on install CD. Used old 'C' drive w/ everything as before. Shortly started boot problems. Installed Viedo Acell Card: Nvidia Geforce Fx5500 256M DDR PCI card w/Driver 56.64. Did not use sound for several days; then the "NO SOUND" was realized, may be conflict !!!!!! Meanwhile; boot problem got worst, no hot reboot (power supply fried & replaced). Then "blue" screens: 0x0000007F "UNEXPECTED KERNEAL MODE TRAP" these got so frequent ( some 5min or 1hr ). Tried to do a OS repair, system locked up W/ Black Screen & nasty message. Have Backup 2wks old. Installed new SATA 'C' drive: Did complete clean reinstall W/ Nivida card on mobo. Installed mobo disk 1st them Nivida disk. Now have A---E drives (Old 'C' is now 'E') + have portable 'F' drive as added backup. Have put copies of most install info & Install Shields in seperate folder. Reinstall from Backups in parts (copy & paste), some from original disk, have most reinstalled w/ Firewall, all security, maint tools, IE6 & OE data restored. Everything is up and running except for some minor progams (need some info on reinstall instructions to run properly). OS: MS WINDOWS 2000 Professional W/ IE6, OE, SP1, SP4, all 80+/- UPDATES (new install). Everything is running smoothly, even fast bootup. Still NO SOUND, MS Media Player, Internet Raido, CD Player all are running/playing -- NO SOUND !!!!!!!!!!!!!! I have access to Realtek Control Panel, checked volume/no mute,set control on '8CH speakers'. tried various plugs w/ headphones NO SOUND. Haved Remove & Reinstalled REALTEK drivers, Note / MS Support/updates KB925902 & KB928843, KB928843, KB888111 are installed (do I need KB888111 can it be removed). MS also talks about added update KB928843 for "XP" can I install this, maybe solve problem, MS said this was fix for variouse devices including "Realtek". Do I have a REGISTRY problem, hate to modify = DANGER !!!!!! I want too proceed w/ caution, need a coach, need to make sure I can undo anything I change. Has been a struggle, there is a soultion out there, yes !!! I need more confidence, thanks COACH, I ready to go. Appreciate your help and guideance.