Seriously need help. my mac book is an old one, 2006 or 2007, and I have problems with the internet. I used to have a great connection, but then I went on vacation and came back 2 days later and was running at like 2 or 3 kilobytes per second as opposed to the 100 to 150 it usually runs. Then, two days later, the internet stopped working entirely. It was broken in both safari and firefox. at first i thought it was a virus, but it worked fine on all other programs. I then thought it was because it I had too much stuff in my hard drive, so I deleted all the junk and ended up with nothing but firefox, itunes and finder. The internet then worked for 1 night and then shut off again. It says that it has full signal strength on the airport menu, but every time I try to load a page, the bars and items are still there, but the page is blank and endlessly says it is loading, but never does. I can't take it in to the mac shop because the screen is broken and I have to have it hooked up to a tv via hdmi, so I can't take it anywhere. Also, system preferences does not work. any help, suggestions, anything? I am on my brothers computer and it works fine. So please help!