Question Mark Problem Startup

my problem is my audio wasnt working and i had stuck cd the i decided to turn the machine off and reset the pram so i did and it was loading with the apple logo and spinning wheel for about 10 min so i decide i would to a force shut down and turn it back on and when i did there was no logo or spinning wheel so i tried the option button button it is just a cursor i got the cd out now but i still have the grey screen for about ten min and the question mark folder logo