no sound in my hp dv6 after installin ardour

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http://askubuntu.com – i installed ubuntu on my HP dv-6 (with Nvidia GEFORCE GT 630M and beats sound) 1 months ago and sound support on my system was great and there was no problem (exept no support of beat driver). few days back i tried to install hydrogen on the system and it was workoing fine then i tried to install Ardour and it was not working as it wanted some JACK configration then i searched for that and solved that issue and started using JACK with Qjackctl but when i rebooted the system i lost my sound support i was not hearing any sound in VLC and also in rythembox. plz help me in solving this problem i (HowTos)