Well. you sure have internet connection, since you can write here ;).
1. When you refresh the chart, look at status bat at MT4 right bottom, what did it say ?
2. Open new demo account from that broker.
3. Install MT4 from other broker and see if its running OK.
Yes, isn't that my request # 2 above ?.
You may also check your firewall, just in case it block MT4.