Pentax 645 help needed, shutter will not fire or advance film to 1st frame

bought what I thought was a really clean 645, l have put fresh batteries in, it powers up i.e lcd screen and the red reading in the view finder but l cannot get it to load the film to the first frame, l have loaded the 120 film correctly but when l depress the shutter button nothing happens, l'm gutted and in the need of help

many thanks Mike

Have you seen this?

http://forum.mflenses.com/pentax-645-guide-modern-photo-test-1985-lens-resolutio...

thanks for the reply, sadly the 645 is still inoperable

It happened to me once and it required a new main board. I cant remember how much it cost but it was surprisingly little along with a full overhaul

Thanks for all the replies chaps, well the 645 went back to the seller and l got a refund minus postage but hey ho not a total loss