No engine cylinder compression

Just replaced head gasket due to overheating. Heads had valve seats replaced 60,000 miles ago. I replaced the head gasket and cleaned up the engine 9 years ago, and it ran perfectly. This time, I took to machine shop and both heads shaved and checked for cracks and leaks. Compression was at high levels prior to gasket replacement. Cylinder #5 where head gasket became damaged, radiator fluid filled the cylinder. After replacing with new head gasket, valves were adjusted per manual, valve lash removed and turned 1 full turn to tighten. New head bolts torqued per manual. When engine would not start, checked for fuel and spark, both good, but compression results on both sides was 0 (zero). Hmm? Any ideas on what and how to check for the compression leak?