Could my PC be damaged?

Last night I was using a program called realtemp to measure the temperature of my CPU (i7 950) and it was at 50C. I click the test sensors button just for the heck of it and it said I needed prime95 and so I downloaded that. I used prime95 to run tests (I don't know what test) and decided to go on facebook for a little while.. When I went to look at realtemp it said my CPU was at 89C!! I immediately shutdown my computer and turned it back on, now it is normal. What do you think happened? And do you think my CPU or Motherboard is damaged? Thanks