White 24" iMac lockup during sleep mode

I have recently been having problems with my iMac it won't wake from sleep and has to be unplugged and restarted or every time it goes to sleep it locks up. The light on the front is on but not flashing as it normally does during sleep. I run Onyx frequently and it does not seem to help for long(Maybe 2 days max) I am at the point where I am only using XP in Bootcamp because it seems to run much better than OS X.
Here are my specs:
24" iMac 250 GB internal drive, 500 GB firewire 800, 2 GB Ram.
USB devices: Wacom Intuos 3 tablet, logitech NuLOOQ, HP Deskjet 5940, VXI USB Translator(USB Audio device for speech recognition) Sentinel Safenet Dongle for Lightwave 3d.
Bluetooth devices:Mighty Mouse and Keyboard, Motorola HT820 headset for Telephony
I have disconnected everything I can and it still seems to lock up under OS X So it looks like I'm stuck with XP until I can resolve this. >:(....

First - you aren't disconnecting any device while your computer is asleep are you? This can cause your problem.
Assuming this isn't the cause, let's do an SMC reset. Shut down the computer. Unplug all cables from the computer, including the power cord and any display cables. Wait at least 15 seconds. Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer. Press the power button on the back to start up your computer. Does it now sleep and awake?
If not srojtas is right that one of your peripherals may be the culprit but rather than disconnecting one at a time I recommend that you disconnect everything but your ethernet cable (assuming you have one) and your USB mouse and keyboard. Create a new account and set the computer so that you have to choose which account to log into.
Restart and log in directly into the new account. If it sleeps and wakes up now you know that the issue is your account or one of your devices. One at a time, connect (and install support software for) a device. Does the computer wake and sleep? Move on to the next. You may find the culprit along the way. Removing it may or may not let the computer sleep depending on whether it is the device itself or the software.
BTW - the device at fault could be a USB or FireWire hub.

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Im just wondering if this hard drive accessing / clicking noise during sleep mode is normal in imacs?
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Russa wrote:
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http://support.apple.com/kb/HT3964
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First - you aren't disconnecting any device while your computer is asleep are you? This can cause your problem.
Assuming this isn't the cause, let's do an SMC reset. Shut down the computer. Unplug all cables from the computer, including the power cord and any display cables. Wait at least 15 seconds. Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer. Press the power button on the back to start up your computer. Does it now sleep and awake?
If not srojtas is right that one of your peripherals may be the culprit but rather than disconnecting one at a time I recommend that you disconnect everything but your ethernet cable (assuming you have one) and your USB mouse and keyboard. Create a new account and set the computer so that you have to choose which account to log into.
Restart and log in directly into the new account. If it sleeps and wakes up now you know that the issue is your account or one of your devices. One at a time, connect (and install support software for) a device. Does the computer wake and sleep? Move on to the next. You may find the culprit along the way. Removing it may or may not let the computer sleep depending on whether it is the device itself or the software.
BTW - the device at fault could be a USB or FireWire hub.

White 24" iMac lockup during sleep mode

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