My iMac goes to sleep and does not wake up, the fans also make a loud noise

My iMac has just had its hardisk replaced, few months ago. Now whenever I go into any website, do downloads and when it goes into screensaver it makes a **** of a noise then when I leave it it does not go into sleep but shuts down. If I try and restart straight away it won't switch on I have to wait a while. I think it gets very hot and might be shutting down. I have cleaned the fans and reset the SMU and PRAM. Any other suggestions or do I need to replace the fans???????????????????

You certainly have a heat problem, since the machine needs to cool down before you can turn it back on. Have you opened the case (as long as it's not an iSight) and vacuumed the fans and air vents? If that doesn't help, you will probably need to take it in to be looked at. Have you checked t see if you qualify for one of Apple's Repair extension programs?

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    First low level warning: No
    Full Charge Capacity (mAh): 4990
    Remaining Capacity (mAh): 4980
    Amperage (mA): -1112
    Voltage (mV): 12389
    Cycle Count: 231
    AC Charger Information:
    Connected: Yes
    Charging: No
    Hardware Configuration:
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    Hmm... I've had this macbook for a while now (?? a year maybe ??) and about 2 months ago I started having this exact issue, close lid to sleep returning it would not wake and a hard reset (hold power for 5+ seconds) is required.
    I too discovered such links as this and also the older (also unanswered):
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    The battery appears to be in okay condition, although I think it might run down a little faster now days than when I first bought it, but I assume this is to be expected.
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    Message was edited by: smerlon
    Message was edited by: smerlon

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