There are almost zero sound cards/chips/etc for PC that WON'T have a "pop" when either powered up prior to turning on an external receiver/DAC/AMP/headphones, simply because they aren't setup with any way to block what is essentially "voltage bounce-back" (rough few weeks, brain is running on fumes, no technical terms from me today).
I get it with my TiHD, HT Omega Claro Halo XT, and various Professional (audio engineer use) cards; it is not something that is damaging, even though it doesn't sound like it is particularly a good thing.
Ironically, my onboard is working without a problem, but as if I didn't have enough stress, the only two problems I've ever had with the computer built around this motherboard have appeared, concurrently....
Problem 1) I am unable to, in any way, install the complete drivers for my Ti HD. I have spent literally ~2-3hrs at a time, at least 6 times, attempting to get it all working right in myriad ways using every possible workaround I can find, but while I still get sound from it (and it DOES appear in Device Mgr as "X-Fi..."), it is not recognized by a single Creative program aka the programs necessary to fully utilize the features of the card. The only thing I haven't done is a FULL re-format because I simply don't have the time right now, although others have said it hasn't made a difference (and yes, I've got driver signing off; no dice...)
Problem 2) All back USB2.0 ports for some reason randomly semi-disconnect any mouse I connect to them. I did the Windows7forum "USB Repair" method, and it's been a bit better in that now it's only freezing 1-3x a day instead of LITERALLY 5 to 25 times a day. The weird thing is that the mice still have power, windows doesn't notice them as disconnected, but they don't response to any input. The only thing that fixes it temporarily is to unplug and replug the USB connector. This is with everything from a RAT3 to MS intellimouse 3.0 to multiple random Dell/HP laser/optical/ball mice to my never-had-one-problem-in-a-lifetime-of-constant-use MX510 that I have been using nonstop since '04...
I am pulling at my hair with all this, and normally I would not be so frustrated but the loss of a loved one, compounded by a number of significant other stressors, has me ready to challenge this freaking thing to a no-holds-barred bout of fisticuffs!