Hello Crosfyer, I am sorry to hear you are having problems with your motherboard; however I will be more than happy to assist you on this issue.
First of all, since you already test the system using minimum configuration, I would like to do it again but out of the chassis. Please include the video card since your motherboard does not come with onboard graphics.
- Remove the CMOS battery and leave the system without it for about an hour. Then put it back on and restart the system.http://www.intel.com/support/motherboards/desktop/sb/CS-028780.htm?wapkw=clear+cmos+battery#datetime
- If the issue persisted, try using another power supply.
- If you have any other compatible processor, please try it.
- A few years ago, we reported a compatibility issue between 6th series boards and 3rd generation processors. This system combination requires a BIOS update. For additional information you may want to check the following web site. http://www.intel.com/support/motherboards/desktop/sb/CS-033076.htm
- If the issue persists and if the motherboard is still under warranty please get in touch with our Warranty Department so they can help you to replace the unit: http://www.intel.com/p/en_US/support/contactsupport
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This still sounds like a PSU failure to me. Remember that the PSU has separate sections that provide the standby power (which lights the LED) and main power. If there is a failure in the main power section, it is still possible that the standby section could be working (and lighting the LED). I would get another PSU to try (before you buy) and check. As Sylvia has indicated, it is a good practice to do this outside of the chassis so that you limit the variables that come into play...