Acoustic Guitar Recording Problem

[KatyMan]

I have a Dean Exotica acoustic, with a built in Dean DMT preamp and tuner. I've had it nearly 6 months. Awhile back, I was playing around with recording it, connecting the jack to the mike input on my computer, and it sounded good, recorded fine, but now for some reason I can't get any low notes to record; if I play an E chord, I get the EBG# coming through on the high end, but nothing lower. I'm getting the same results on 2 machines. Could it be the pickup in the guitar? Is it my cord? I'm using a regular 1/4", with a little adapter to get it down to the 1/8" (I guess?) input on the sound card mike jack. Any ideas?
Thanks, and I'll hang up and listen.

ETA, I'm recording using Kristal.

[KatyMan]

1. Took it to the shop today

and apparently it's the pickup, but nothing serious. The last time I had new strings put on and a setup done, apparently the saddle moved a bit off the soundboard, meaning the bass strings weren't within range. So, the guy at the store is taking care of it.
If anyone is in Katy/West Houston, I can recommend a great guitar shop!