iphone keeps rebooting then get stuck at the apple logo HELP!?

[Mac Os x]

i installed Installus on my iphone then it asked to reboot my device (worst move i ever made) then it just rebooted went to the apple logo then i put it on the desk and i looked at it 30 minutes later and its still at the apple logo then i done a hard reset by holding the sleep/wake button and the home button and it shut down then started up then shuted down then started up i tried connecting it to my Mac but itunes wont recognize it because its not booted all the way and it wont let me go into Recovery mode cause it keeps rebooting please help