Can someone help me out? I made a program at school to copy a bitmap to the primary surface and then display it, it worked perfectly and then I took it home to work with it and it doesnt work at all. If I set the screen resolution to 640 480 it blits several of the same bitmap with lines through it but when I change it to 800x600 it doesnt blit crap my bitmap is a 800x600 16bpp bitmap. Can I please email someone my code so I can get help?

is the resolution and color depth the same on your pc & the one at school?

I''d start by setting your machine to the same settings as the school computer...

Thanks that was the problem