My guess is that it is coming from the harddrive. If a motor or a fan goes out it either makes a high pitch whine or a droning type sounds. The cricket noises that you are hearing may be the harddrive disk sticking to the head of the drive. It would explain the freezing and the noise. See if the problem persists. There are two options that you have, but should really only be used as a last resort. You can either take the harddrive out and lightly bang it on a sturdy surface three of four times. Notice I said lightly. The other is to put the drive in a ziplock bag and make sure that ALL the air is out. Stick it in the freezer overnight and it should put the two parts of the drive far enough away from each other that they won't stick. Like I said these should be used as a last resort and wait a couple of days to see if the problem continues to persist.