iMac problem

I'm new to the forums and I've been looking around and really haven't found an answer to my problem. I've had this iMac for a while now, I use Cs5 on it and lately it's been saying my startup disk is full. I checked my storage info and here's what it says: Other is taking up 987.07 GB while everything else is taking hardly anything up. What should I be removing? How can I fix this?

Search for an application called Disk InventoryX and run that to get an idea of what files you have and how big they are. You can then start deleting the ones you don't need. If yo.u have a 1TB drive, you are dangerously close to running out of space and running into issues with OSX..

There's not something stuck in the trash is there. Had this problem on a colleagues machine a couple of years ago.