Okay guys, I've tried EVERYTHING to resolve this issue and still no luck so I'm really hoping that someone could help.

I purchased a Compaq SR1834NX MCE PC several months AGO, and everything was working great. I decided to add a TV Tuner card (not included in the original package), so I ordered a HAUPPAUGE WinTV-PVR 150 Media Center Kit. I installed the card, and it worked great.

Since I was using onboard video, I upgraded my video card to a MSI RX800 PCI-E Video card. Again, things were working great.

Pressing my luck, I decided to update all of my video drivers, as well as update the BIOS to a newer version listed on the Compaq website (for my specific COMPUTER). If I remember correctly, when I updated the BIOS, I received a checksum error but the computer continued to reboot before I could go into the BIOS SETUP and RESTORE the defaults. Since then, I have not received any BIOS error messages.

I BELIEVE that it was around this time that I started having the problem with watching TV through the Media Center. Now, when I try viewing TV, it takes about 5 minutes of the spinning MC (arrow) wheel before anything appears, and then the audio and video is VERY choppy and unwatchable. The computer also becomes EXTREMELY slow and unstable, requiring me to end the MC in order to perform any tasks (browsing, opening programs).

As I mentiond, I've been working on this problem for weeks now. I've upgraded codecs, restored my drivers, removed the ATI video card and used the onboard video with no resolution to the problem.

I even formatted the hard drive and re-installed the OS with no luck - the problem persists.

The only ideas I have left is that either the BIOS upgrade has caused an issue, or the tuner card has gone bad in some way.

When I view system resources when the TV tuner is running, I see that my computer's 'interrupts' are using the majority of the system resources.

My BIOS version is showing as 3.13. Another thing I noticed that seemed odd to me (could be normal?) is that when I go into the BIOS, I see the following:

First Channel Device 0 - None
First Channel Device 1 - None
Second Channel Device 0 - HL-DT-STDVDRRW
Second Channel Device 1 - None
Third Channel Device 0 - Samsung SP2504
Fourth Channel Device 0 - None.

Should the HD be showing on the First channel? Would this matter?

The CPU is a AMD Athlon 3500+. There is 1 gig of installed RAM.

I believe that my PS is 200W. I know that the Video card recommends a 250W min. PS, but I have seen posts where a 200W PS works fine with the video card. I would also think that if it was a problem with too small a PS, the computer would be experiencing other problems, correct? Also, I was using both the tuner card and video card with no problems previously.

I also noticed that the support documentation for the Compaq suggested that if a TV tuner card was added, a USB tuner card was suggested. Again, the tuner card was previously working fine, so I assume this wouldn't be the issue.

Ugh. This is driving me CRAZY! Any help would be GREATLY appreciated.

Thanks!!