Cinema HD Monitor will not come on after start up

Hi all!

Glad to be here in this forum. I hope someone has an answer to a possible fix or at least in what direction I need to head in solving this problem. After booting this computer up in the morning everything on the CPU is running (can hear is clicking and fan going...etc.), except the monitor will not come on. Only after hours of unhooking and re hooking up the monitor from the CPU and turning off everything including the serge protecting power strip does it finally come on again. I't happened now everyday since last week. I have gotten to the point I'm not shutting down anymore. Please let me know if you need information regarding what OS X system or other specifications you might need to be able to offer assistance.

Thanks in advance for any help in this matter!
Glenn