These are just guesses, but probably good ones. 24 is most likely your ambient or case temperature, 32 is likely your motherboard temperature, and 56 is your CPU temperature. If you say the CPU isn't doing anything, then that's a bit high, especially if it's just testing the back of the CPU package (the side with all the pins). But if it's going by the thermal diode, that's an OK temperature. Consider opening your case and seeing if those temperatures go down any.