What's the problem with my S2 IS?

[cameraman-2011]

Hi,
after one year I decided to use my Canon S2 IS, but I noticed every time I took picture, it was completely black, so I thought maybe it's a stuck shutter problem.I took many pictures (and also hit the camera several times with my hand) and suddenly the problem went away. But this time when I take pictures it acts in a strange way.I don't know if there's a problem with it's lens or sensor or it's dirty or something else?! I put some pictures here, so you may be able to help me with this. Can I repair it myself? I'm in a hurry and should get it fixed in 2 or 3 days and no camera repair shop or anything else is around here.

Thank you for your help

note:all pictures are directly from camera and they are cropped to reduce size

indoor-fluorescent lamp-automatic: you see horizental lines
http://www.photoradar.com/photos/144...an-2011/indoor

indoor-fluorescent lamp-Aperture Priority(same as above but with aperture more than 5.0):green tint and those lines
http://www.photoradar.com/photos/144...uremore-closed

outdoor-sunny day-automatic:it's like camera can't recognize the amount of light: overexposure and maybe the lines
http://www.photoradar.com/photos/144...n-2011/outdoor


but sometimes in ideal conditions (light) it can take good pictures!?