Latest OS. Mac Pro year old. Went onto 2nd internal hard drive to copy some photos onto Desktop. Message words to effect 'preparing to copy 6800 items onto desktop' spinning pizza came up and stayed up. Cant force quite screen frozen, mouse does move pizza. Swithced off, left for while and on, still the same. left off for several hours then on likewise. switched off and unplugged all. still frozen, tho time is now correct. Any thoughts? Desperate, deadlines!!! All on comp!! Thanks in advance Mik