"Chirping" Noise and Sleep problem

My 1st gen IMac G5 has been making some "chirping noises"for the last six months. They seem to be coming from the lower left quadrant of the monitor. They really get busy when the computer is starting up from being shut down. I am hoping this isn't a hard drive issue, as I have already had one replaced after a failure.
I also have a problem with putting the computer to sleep. I usually have to sleep it twice for it to stay asleep. Then when I check it again the next day, sometimes it is awake. It wakes up to my login screen and I have no screen saver for that one.
I would appreciate any input regarding these issues.
Thanks, Bob Bullock
1st Gen 1.8g, 20" IMac G5, 160gb Mac OS X (10.4.8)

To Apple Discussions!
I have no idea what could be causing the "chirping" sound as you are starting up from a shutdown unless there is a cricket inside your computer that doesn't like cold bootups.
Since you mentioned a previous HD issue, see if you qualify for the iMac G5 Repair Extension Program for Video and Power Issues
**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**
Regarding your sleep issue, see Knowledge Base Article: http://docs.info.apple.com/article.html?artnum=300341 How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005)
Good luck!

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