My hamster isn't running on his wheel any more, whats wrong?

I've had my hampster for 6 months or so and he was always happy, running on his wheel, etc. We had to move him to the basement a little over 2 weeks ago and since then he doesn't run on his wheel. All he does is eat and when he wakes up he comes out of his hut and sits in the corner where he pees and sleeps some more. Is there anything I can do? I can't keep him upstairs anymore, why is he acting this way and can I make him happy again?|||He might be depressed. Is there a window in the basement? Also, it might be cold for him. Maybe you can keep him in your bedroom or something.|||HE IS MAD AT YOU, FOR PUTTING HIM IN THE BASEMENT.|||Maybe its his way of rejection as you have moved him,has the basement got plenty of light.|||he might be depressed since he is in the basement,animals do have feelings.is he getting enough light down there? another thing when hamsters get older they do tend to get lazier|||He needs to get some hamster ***.|||Maybe he is pregnant.The best way to check is to go to the doctor to make sure.|||He realized he was getting nowhere|||He must have reached his destination. No, I think he is either depressed because he feels ignored and abandoned, or it is too cold or not enough natural light. Animals get used to human contact and human activity and he probably feels lonely. Please, if you can't give him your love and attention, give him to someone who can.|||Hamsters dont like being isolated. They are happier around people. If you are going to isolate it, then buy it a companion of the same gender. Right now it is depressed, and could end up dying because it it unhappy.|||Animals, like people, feel sluggish when overweight. Try feeding him less and he will be more prone to exercise.|||would you like living in the basement alone ? Maybe he feel's unwanted and abandoned? was he near a window where he could get in the sun light ? do you realize we and all living creatures need vitamin d from the sun light? is his wheel dirty , or hard to turn. is it getting to small for him? maybe he miss's being closer to his human counter part's . seeing other human's or hearing them . , try leaving a radio on low to keep him company . something soothing for music . not heavy metal . maybe Country ?