My iMac literally will not turn on (brand new)

My brand new 27 inch iMac is not even a few weeks old. I've had in about 2 weeks I'd say. I had everything set up on it, it was completely up to date, plus I installed all new software on it, each only allowing 1 install (Final Cut, iwork,etc.)
It started turning itself off every now and then and I figured it was my family doing it thinking I wasn't using it because I always kept it on and let it go into sleep.
It was on earlier today. I hit the mouse to wake it up and realized it wasn't on so I tried to turn it on. Nothing. Held the button in. Nothing. Checked the cord several times, checked the wall outlet, tried different outlets, removed all accessories, I tried everything I could that I found in troubleshooters. Absolutely nothing.
Needless to say I'm incredibly angry. This is a brand new computer and it will no longer TURN ON. I only spent the last two weeks personalizing it with programs, apps, information, everything and now it won't turn on! Ya, I could put the hard drive in a different computer but thats not the point. This is not a problem I should be having and I find it outrageous that its happening. What's going on here and how do I fix it?

I'm having a very similar issue - not yet two week old iMac 27 shut off tonight and will not turn back on. I tried all the stuff found in the trouble shooting section (reset SMC, PRAM). Once,the fan powered up on high, but nothing else came on. Now I cannot get it to respond at all. I've checked the plugs, tried the power cord from my still working older iMac 20, but absolutely nothing. It shut off once as I was plugging in a powered 7 port USB hub, but I thought I may have bumped the power cord somehow and it shut down.
I restarted the computer, but couldn't find the items that were on the USB hub, a printer and external DVD drive, so tried the hub in a different USB port on the back of my Mac. As I plugged in the hub, the computer shut down, and I haven't been able to start it again. I had already used this hub on my iMac 27 - we moved the computer into another room and were putting everything back together.
Any ideas?

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Try resetting the PRAM and the SMU
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.
Can you see the iMac in Target Disk Mode?
Have you tried booting holding the Option key down? Can you boot from your install disc?
Please post back with results.

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Yesterday night my second iMac G5 (3 or 4 years old) froze while I was using Google Maps. The screen was completely frozen, I could not move the mouse or anything. After a while the fans suddenly began going very fast and were louder than I had ever heard before. I waited a while and then shut down the computer using the power button and restarted. The light came on as usual, but there was no "on" chime and the screen remained dark. I could hear the fans going very quietly, but nothing else happened, so I again shut down, this time removing and reconnecting the power cable before restarting. Same result, nothing. Each time I shut down I did hear an odd click noise, which sounded like a heavy clock tick, and it scared me because it's similar to the sound a heard the last time I had a problem with this computer. It was 2 or 3 years ago, and for an unknown reason the computer would shut itself down and eventually did not turn on. I ended up losing the entire hard drive. The sound was not exactly the same -- last time it happened, there was a steady ticking accompanied by a series of beeps, but I thought I would mention it.
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1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
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3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
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If you can, then reboot from your internal drive and repair permissions.
I am also suspicious of the RAM, so would advise removing one stick at a time, and then alternating them to see if one of them is bad.
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Hi: This is a peer to peer forum. No one on this forum is authorized to respond on behalf of HP to any posts made here. I looked at the support and driver page for the 14t-1000, and that model is 5 years old according to the release dates of drivers listed there. Ar you sure that is the model number? Can you please post the product number for the PC? The product number can be found on the same sticker as the serial number. You can also post the top line of each hardware ID's for each device needing drivers. I'll see what I can find. The driver directly from Realtek should install the card reader (PCI Device). You want the first driver on the list. http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=15&PFid=25&Level=4&Conn=3&DownTypeID=3&GetDown=false

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Try an old OS installation and see if it succeeds (Snow Leopard, Lion, Mountain Lion, etc)
Try an install to an external enclosure
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Please click "Accept As Solution" if my help has solved your problem. ----------}
This is a user supported forum. I am a volunteer and I do not work for HP.

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Ok, the Snow Leopard disc did not have the AHT thingy on it, but the Tiger one did. Currently running extended test. Had to reset the SMC to get the thing to turn on. I will do the test twice, then reset the PRAM and give you the results.
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