I don't know much about the device but the "K" sounds like it means there is an issue with the Black toner / drum since Black is the K in CMYK.
That would explain the inability to print, not sure why the power button would fail to work.
oops. adding this to get an email reply :)
cp105b when turned on, it does the whirring paper roller noises then displays
on/ready green light
and K light
both lights are static.
there is no obvious error
then the device will not respond to anything - the power button does nothing, nor does the computer have any luck with connecting.