I had very similar issues and it turned out to be a very similar system and let's hope. Look at the HP d4999t and d5000t. It's very similar and here's what I found.
1. The 1 TB HDD had a firmware update. That was scary but helped, but no cure.
2. Turns out the Intel Rapid Storage Technology app was not optional.
Hope this helps,
I am having a sound-related issue that I think may be related to USB.
When I plug in a USB device, such as a flash drive or my cell phone, my computer will freeze for a couple of seconds, and I will often have sound issues.
One such issue is my system sound becoming very quiet for no reason, even though all volume settings are correct. I have to restart the computer for the sound to normalize.
Another issue I had was when I unplug a flash drive, if I am listening to music from my hard drive, it will pause for no apparent reason.
I have never experienced issues quite like this before, and I would welcome any suggestions as to what may be causing the issues, or how I might fix them. Thanks!
A little bit about my system:
Intel Core 2 Quad Q9400
8 GB RAM
1 TB SATA HDD + 1 GB External USB drive
Sound Blaster Xtreme Audio card
GeForce GTX 285 video
Windows 7 Pro 64-bit
If you need any more info, just let me know.
Thank you in advance!