To this day, I'm still using a Dell XPS 710 PC that I bought back in early 2007. It's probably approaching its end-of-life stage, but I would like to use it as much as I can before I decide to purchase a new one. The specs: Intel Core2 Duo Processor, 2.4 GHz 2 GB RAM 250 GB (+500 GB) Hard Drive 1GB NVIDIA GeForce 7950 GX2 Dual-GPU Graphics Card Windows Vista Home Premium, SP2 Ageia PhysX Processor X-Fi PCI Sound Card I've had problems with the PSU in the past, but now the problem is that there is no audio. I have a BOSE speaker that I plug into the audio output jack (marked by a small headphones symbol). About three weeks ago while I was listening to music, I heard a high-pitched screeching noise. Shortly thereafter, my computer crashed with the Microsoft Blue Screen of Death. I rebooted several times and it kept doing the same thing. Finally, I unplugged the speaker. Now every time I log back in and plug in the speaker, there's no sound whatsoever. When I go to the Sound settings, this is what I see: Speakers High Definition Device Not Plugged In Digital Output Device (SPDIF) High Definition Audio Device Working I've even gone to the sub-settings to try to reinstall or update the driver, but the system says everything is up to date. The only thing different I've noticed (that I didn't before) is that the settings under Speakers Properties display four audio jacks in the rear. But as far as I've been using this PC, I've always plugged in the speaker(s) in front with the headphone symbol. Besides, I've tried inserting the speaker cord into any of those jacks in the back of the tower, and still no luck. Could the problem be with the audio card? The settings appear to be OK. What say you? Thanks for your input.