Ps3 turns on has background but no menu bar

Switch the PS3 off (Red Light). Hold your finger on the power button until the PS3 switches on and off. Take your finger off and hold it in again. It will come on. Hold it until you hear a double beep and take it off immediately. You will then be taken into a recovery menu. It will ask you to connect your controller via USB. Choose option 3 - Restore File System (Do not try any other option as it will erase some or all data on your HDD). It should work after this.

I hope it helps.