New PC build restart when shutting down.

Hello, I recently obtained a nice barebones kit from tigerdirect. Everything works perfectly except for the fact that PC will only restart. When I push the power button on the front panel, or do a soft shut-down through the start menu, Windows 7 will try to shut down like normal. But when it gets to the very end and the screen has dimmed, it bursts on again, as if it's been restarted.

All the "Wake on's" are set to off/disabled in the bios, and I know for sure that the front panel cables are correctly connected to the mother board. My current hardware is:

-MCP61M-M3 Motherboard
-AMD Athlon II Tri-core processor
-OCz Vertex 2 60gb SSD
-diablotek 500 Watt ATX PSU
-4gb RAM Stick x1
-and an nVidia GTX550TI

I have yet to clear the CMOS or re-install Windows 7, any advice?

What do you mean by a "soft shut-down"?
Open the power options menu in Windows 7 and check how the power button is set, sounds like it is set to restart when pushed instead of shutdown.

A soft shut-down as in hitting the windows key and selecting "Shut-down" as opposed to hitting the power button on the physical PC.

The power supply is brand-new, so I doubt it could be faulty. Although the GTX550TI does require a combination of 2 seperate power cables from the powersupply into the card itself.

Alright, thanks for the help man I've tested the front panel a zillion times, and im sure it's not that.

Using the case power button and using the shutdown button in Windows are the same function, holding the case power button down for 5 seconds to shut down Windows is a hard shut down which would be the same as pulling the power cord out which can cause problems with windows as the ram does not get flushed and data contained within the ram is lost.

Now with that cleared up it could be hardware or a software problem, first thing make sure you have no USB devices connected to the pc except your mouse and KB and see if the pc will shut down correctly.

If the pc still reboots then I would strip the thing down to a basic setup, that means cpu+heatsink/fan, 1 stick of ram, graphic card unless you have an integrated one and that is it. Disconnect all USB, sound and front panel headers from the MB except the power button and then try powering on the pc, it should boot and then try to enter BIOs, if you can do this then hit the power button and the pc should power off, if it does then you know your MB and power supply is not the problem, now add one item back at a time and test after each one until the problem pops up. If the pc shuts down with all the hardware installed (not booted into Windows still all in BIOs) you know your hardware is good and it has to be a Windows setting or problem.

I have been buying from Tigerdirect for years, they have great service. Have you talked to them on the phone about the situation ?