Hello, I have AMD-Athlon 64 Bit system with Windows-XP (SP2) and RealTek AC97 (ALC850) soundcard. I got 'EAccess violation' error message from RealTek when I tried connecting audio tape device to my PC using Line-In. Since then whenever I try to plug into Line-In, I get this message and the audio is played only through the left speaker. While attempting to figure out the problem, the sound became more and more scratchy and finally stopped completely for both system sounds and other playback. I installed latest driver from RealTek Website and finally managed to get rid of scratchy sound but a new problem has started now; the speakers go mute soon after the windows log-on sound. I can play any music only after manually re-enabling the RealTek driver through device drivers screen. I have checked every single setting mentioned in Windows Troubleshooting and they are all correct. Any idea why this is happening ? The problem with Line-In still exists. Also if I run RealTek sound manager-> connector sensing, the result always shows that front speaker & Line-In connections are not properly plugged in even though the speaker connections are right and there is no Line-In. Could this be a hardware problem ? Any suggestions will be most appreciated. Many thanks in advance.