PLL is not working in Cylcone V GX (Using Integer PLL)

Yes - I looked at the bits of schematics you attached. The problem is, if you want to use a PLL, you're feeding your clock into the wrong pin. The PLL cannot be fed by that pin.

Using an ALTCLKCTRL block won't help as it can't be fed by a clock going into the pin you've chosen. This IP block should be fed by the output of a PLL, not the other way round.

You need to modify the board to either: a) feed the clock into a dedicated clock pin; or b) add a wire loop on your board between an unused I/O pin and a dedicated clock pin and feed your clock signal out of that I/O pin so that the clock is fed to a dedicated clock pin.

Cheers,

Alex