Cyanogenmod Boot Loop, Can't Access TWRP

Hi! Yesterday I rooted my Kindle Fire HD 8.9 with no problems. The problems came after I installed TWRP before installing Cyanogenmod and GApps. Long story short, I got those on there eventually, and when I rebooted my Kindle, it showed the Cyanogenmod splashscreen/ animation, so I thought everything went well. After about, probably, 8 minutes it flashed the Android lock screen, but that's it. So I turned it off, then on again. Now, when I turn it on, first it shows the regular "Kindle Fire" logo with "Fire" being in orange, and then changing to blue, then it just loops showing the Cyanogenmod animation, then flashing the Android lock screen for a split second, then repeating that from the Cyanogenmod animation. I can't get into TWRP when I press the volume up key IMMEDIATELY after I turn the Kindle on. But, I can get it into Fastboot mode, except anytime I do a command, it'll either say "error: device not found", or something like, or it'll say "List of devices connected" followed by the serial number, and next to that "offline". If anyone could help me with this, it would be GREATLY appreciated.