Ive been able to record and now i cant record bcuz the screen says "no inputs..." but i can hear music thru the inputs and the lexicon alpha is selected as the input and output sourc. whats wrong????

Maybe you need an external microphone. Or, you can also use some audio recorders like Leawo Music Recorder to record audio from computer.

Leawo Music Recorder is a superb but easy-to-use music recording software program that lets you record free music from any built-in input audio, computer audio and online music sources, like YouTube, Spotify, AOL Music, Last.fm, etc. and then save in MP3 or WAV format with lossless quality.

Apart from recording music and audio without quality loss, this music recording software could also automatically download and add music tags like artist, album, album artwork, song title, etc. to your recordings. It even allows you to edit these music tags manually. Moreover, you could apply recorded music files to iTunes music library in only one click for further sharing and enjoying.

It sounds like you have NOT connected via the recording software.
It is like the normal Windows software audio has hijacked the audio system even though it is external.

Go into your recording software and look for an option to select the Lexicon device. You did not tell us what recording software you are using.

This is not an uncommon problem with these external audio recording devices.