Digital Popping while recording...help!

[-passenger-]

Here is a question that has had me baffled. I just went to start on a new project on Sat. and when we started laying down drum tracks I was getting a digital popping noise. None of the levels were peaked and it appeared randomly throughout the recording. It also appeared on every track I recorded which was 7.

I've recently done another project without any problems what so ever. However I did just add some new gear. Here is my set-up before the addition:

Gateway 933mhz Desktop PC w/ 256 mb RAM
Windows XP Professional
Vegas 5.0
Bearhinger Eurorack UB2442FC-PRO
M-Audio Delta 1010LT PCI card
Jade 8 Channel XLR Snake to the board
Hosa 1/4 male to RCA male snake to the card
PC Desktop Speakers

I've used this set-up hassle free on another project using the same amount of track. However I just added this:

Roland DM-20 Active Monitors
4 Channel Headphone amp

Could the power source be causing this noise? I've elimated all the new stuff and tried recording the old way and still get the pops. I've even tried recording a single channel thinking maybe the memory was being overworked. Nothing seems to work. If I record dead air then I get no popping. It is only happening when signal goes into the card. It isn't popping on hits or anything that makes sense. It's just random pops. Any ideas?

 

[Bulls Hit]

Not sure how it worked before coz that's not a whole lot of memory to run XP Pro while recording 7 tracks on a 933 machine.

Try increasing the number of buffers in the Delta Control Panel.

Have you got an AGP video card in there?

 

[-passenger-]

I'm not sure what kind of video card is in the machine. It's all built into the motherboard. The pc isn't great. It only has 2 PCI expansion slots. I know the RAM is on the low side. I don't know how it worked before either....however now I can't even record 1 track without this happening. Which tells me it isn't the RAM. Because just last week I recorded 35 min. straight with 4 tracks.

Could the new monitors being to close to the CRT or pc have any effect on this? What about a headphone amp. The thing is I turned all of this off and tried recording without it.