If it turns round but doesn't heat, the heating element has probably blown. These things aren't complicated inside - unlike a washing machine. You can try taking it apart to see what you can find but it may be a weekend trip to Comet otherwise.
Turn off the supply,remove the back panel and check wether there is a thermal trip some of these just need pushing to reset others melt if this is the case they are fairly simple to replace,but if it is quite old and the element has gone you will have to do a bit of phoning around,good luck