IMac 1.6Ghz wont stay awake...also Boeing 747 noise!

This 1.6Ghz iMac recently started shutting OFF when sleep time hit in the Energy Saver System Prefs. It would also shutdown if you use the sleep command.
I've tried resetting the SMU and using the Apple solution of plugging it in the back while holding the start button, but nothing works.
Used DU also.
Ideas?
Also whats with the Boeing 747 noise? Super loud fan noise. Vents are clear so why...?
Perplexed Steve

Try resetting the PRAM. The 747 noise is the fans not being controlled by the SMU, it could mean the either your thermal paste has dried, a connection to the fan has failed, or your power supply unit is failing.

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Hi jordan 572
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Failed to awaken when W8 computer did.
Have tried the monitor on W7, XP, another W8 computer and a Mac OsX - on all of which the monitor had previously worked.
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Hello @PanzerFaust,
I understand that your HP f2105 21 inch LCD Monitor will not stay awake and you are looking for a resolution to this issue. I am providing you with some steps you can try below:
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Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
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Please help!
My G5 won't stay awake. Yesterday when I was using my computer, it went into slep mode while I was online. I pressed a key on the key board, and it woke back up for a few seconds, and then went back to sleep. I went through this a few times, and it kept doing the same thing. I was eventually able to keep it awake long enough to shut it down. Today, it was doing the same thing, so I shut it down, and unplugged it for a while, and when I plugged it in and turned on again, it would still only stay awake for a few seconds. Rign now, it is unplugged.
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nadiamilan wrote:
I think that is an great idea . But I wanna know if there is anything else i can do besides going all way back to the place i got if fixed at ....
Probably not.

IMac 1.6Ghz wont stay awake...also Boeing 747 noise!

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