What soundcard is in the computer? Most turntables use RCA phono plugs and most soundcards have miniphone jacks. How are you connecting the two. The turntable definitely needs a preamp to get it to line level. Is the soundcard recognized by the computer? Check Windows device manager. Check the Windows mixer to make sure you don't have the line in fader turned down or muted.
Dave
Computer: Intel i7, ASROCK H170M, 16GB/5TB+, Windows 10 Pro 64-bit, Sonar Platinum, TASCAM US-16x08, Cakewalk UM-3G MIDI I/F
Instruments: SL-880 Keyboard controller, Korg 05R/W, Korg N1R, KORG Wavestation EX
Axes: Fender Stratocaster, Line6 Variax 300, Ovation Acoustic, Takamine Nylon Acoustic, Behringer GX212 amp, Shure SM-58 mic, Rode NT1 condenser mic.
Outboard: Mackie 1402-VLZ mixer, TC Helicon VoiceLive 2, Digitech Vocalist WS EX, PODXTLive, various stompboxes and stuff.
Controllers: Korg nanoKONTROL, Wacom Bamboo Touchpad