It has been a long time since I have had any memory problems. In fact the last time was with pc100/pc133 memory.

Your situation concerns me a little since I have a Compaq CQ60 -210. From what I can research it is virtually identical to the HP alternative. I am waiting for delivery of 4GB PC-6400 on Monday or Tuesday. I purchased OCZ memory from TigerDirect.

I will report back once it is installed.

Your problem sounds like an incompatibility issue to me. Suggest you contact Crucial support for assistance.