图片显示不出来

我安装了imagefield，imageapi和filefield几个模块，创建了field_image字段，可是上传的图片都显示不出来，看了别的文章，说是.htaccess文件的原因，但是，根目录下的这个文件，我已经删除了，但还是不行，图片有上传到files文件夹下，可是，图片就是显示不出来，我将图片的地址直接写在浏览器的地址栏上，就会报错
以下是错误信息：
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [no address given] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
请大家帮忙解决一下吧，谢谢了！