sub and amp not working

Yeah as spence said just try and use a piece of wire (any really) to connect directly from the power (red cable) to the remote (blue cable - r) on the amp, this will atleast round it down to the remote to see if its the problem.

Could also be the fuse though, so pop the bonnet and have a look to see if the gold wavey piece is still intact - if not, the fuse has blown and you need a bigger one! (i dont know what size was in it tbh, but it should of been enough!)

Nah look yourself Shmik, dont let Halfrauds con ya! You check the fuse?

If the power lead came out it might have touched the earth or amp casing etc, pull out the fuse in the amp and check that! The power lead was alittle short, I cut off as much as possible to use for the ground - only not to need it in the end anyway! Uber gay! Makes it awkward to check the wire goes in properley but you can whack the back seat down behind it and double check that way or just squeeze your head in the boot!