Q: Mac Pro 2010 unresponsive after sleep, and had to be powered down forcefully twice today.

Dear Administrator,

My Mac Pro was unresponsive after sleep twice today, which had to be shut down forcefully.  The display had nothing shown on screen and keyboard presses were of no use.  Turning off the display then on doesn't solve the problem.  The mac does seemed to wake up but I can't tell.  After shutting down and turning on, there is no crash reporter open.  Is the Cinema HD Display acting up? or is the Mac Pro having an issue.  In the last couple of days, Quicken for Mac 2007 had trouble with a net worth graph when date range and accounts selected are set to certain specific values.  Please advice!

Thank you very much for your time and effort in this matter.

Sincerely yours,

Zigang Pan