Mac falls asleep and won't wake up

I need help fast diagnosing my Mac Problem!
Out of nowhere yesterday my machine started to automatically shut down and go into sleep mode without me touching anything or making any settings changes. The screen goes blank. The hard drive winds down but comes back to life once I click my mouse. This is now happening every few seconds and I cannot even run diagnostics before it shuts down.
It's a PowerMac G4 (Quicksilver with 5 hole front). About a month ago I upgraded to OSX Tiger 4.7 and was running fine with no problems.
I check energy saver and made sure it was set to 'never' for the sleep selection. I disabled my hot corners but it still keeps doing it.
I even unplugged the system and vaccumed out the dust from the fan grates thinking it was overheating and powering down as to protect from overload but still no go.
I don't know if this is software or hardware related issue or if I picked up a virus. I've never seen or heard of this problem before and can't find any info on it.
If anybody has any information or suggestions please respond here or email me at [email protected]

Try using Disk Utility to repair your startup disk (hard drive) as shown in Dr.Smokes Resolving Disk, Permission, and Cache Corruption as Archeeum so helpfully suggested (if it stays running long enough!). The link will show you how.
Cheers!
DALE

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Hi @LMG123,
Welcome to the HP Forums!
I am sorry to hear that your HP Officejet 8620 will not wake up after falling asleep, but I am happy to look into this for you!
How is the printer connected? Wireless, Ethernet, or USB?
In the meantime, please try the following:
Make sure the printer's power cable is pluged directly into the wall outlet, and not a surge protector. Issues when Connected to an Uninterruptible Power Supply/Power Strip/Surge Protector. This applies to Inkjet printers as well.
Firmware update. Getting Printer Updates for HP Officejet Pro 8610, 8620, 8630, 8640, and 8660 e-All-in-One Printer S....
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RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

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Ops I replied to myself in error.....
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Mac falls asleep and won't wake up

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