CSS on all is broken!

I have a mysterious problem. After support team reboot server where my VPS is set up, my sites lost they CSS. For example:


CSS files are okay, I can open it from web.
It works in IE 6.0 (I do not know why!) and do not work in Safari and Firefox.

Do you have any idea?

I checked http://matakov.com/wp-content/themes/journalist/style.css at http://jigsaw.w3.org/css-validator/ and there is something wrong with the coding.

It says “I/O Error: Unknown mime type : text/plain”

Can’t quite figure out what the problem is, though.