Volkswagen Polo selecting gears

Loss of ability to engage gears except reverse. No crunching or other noises except a spring type noise and all worked fine again. When gears are present clutch test will stall engine. Spring noise and then loss of all except reverse. Slave appears to work OK Cables for changing all adjusted as per Haynes manual. Cannot SEE any damage under dash at foot pedals. Is there a test for pedal box please? Pushing finger into slave aperture produces metallic engagement on clutch release bearing operating arm.