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[usmc_gysgt2006]

I decided I wanted to try and build my own computer. Which has been a great experience until now…

System:
Motherboard- ASUS P8Z68-V PRO LGA 1155
Processor- Intel Core i5-2500k Sandy Bridge 3.3GHz
Graphics Card- SAPPHIRE 100315L Radeon HD 6850 1GB
Ram- 8 Gig
Cooling Fan- ZALMAN CNPS9500
OS- Windows 7 Premium 64 bit
XION Mid tower PC case

I had everything together yesterday, system booted up fine. Only weird thing was that when I would turn system power on, motherboard would light up, everything would run then shut down for a second then start up. I loaded on OS then proceeded to load on all drivers. The Bios was showing that my CPU temp was around 60 degrees Celsius so I removed my heatsink, cleaned off all thermal paste and then reapplied and reassembled. Bios now said my temp was down to 50 degrees. Installed all drivers and everything was fine , shut down computer after playing for an hour. Today the computer will not start up, the motherboard is showing a red LED light next to the CPU. The fans are all running and the system lights up from internal LED’s but won’t seem to go into the OS. The manual says that this is a diagnostic POST showing an error. I have not tried to over clock this system. Can anyone help me out here?

Mario

 

[lp231]

Most Asus boards does that, my s775 Asus Rampage Formula will turn on for a second, shutdown and then turn back on. There's nothing wrong with that.
Now for your problem, did you check what that red led light indicated in your motherboard manual?
What power supply do you have? If it's came with the case, then that may be your problem.

 

[usmc_gysgt2006]

Power Source: Rosewill Green Series RG630-S12 630W Continuous @40°C,80 PLUS Certified

The manual says that its a Power On Self Test... showing their was an error. "The LED will continue lighting until the error is solved"

 

[lp231]

According to the manual, it says the LED will light up next to the component it detects that has a problem. So if the CPU led is the one that is on, check your CPU.
Take it out, check for broken pins, and reinstall it. Make sure the HSF is install correctly.