My Computer Turns On For 3 Seconds, Then Shuts Off

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Even though there are other possibilites, a bad motherboard seems to jump out at me. I think that may be the problem, still make sure the heatsink is in full contact with your cpu first though.
 
I confused jbj190's post with yours.

If it does not boot outside of the case on cardboard, with two different PSUs, then it is either mobo or CPU. Make sure HS is attached good. I don't know about yours but some mobos look to ensure that CPU fan is spinning or they shut down, so it might even be a bad cpu fan. Try plugging another Case fan into the cpu header temporarily to trick the mobo. If it boots don't leave it running too long with the fan on the HS not spinning. Other than that, my best guess is that it's either CPU or mobo, most likely mobo. Maybe someone else has an idea.
 
I checked the heatsink, it looks fine to me. The fan spins like I mention before.

I am gonna have to go to a PC repair shop and spend 300$, I haven't overruled the CPU or Mobo. I don't have another mobo or CPU or heatsink to test.
 
Me too,

Updated Info:

Today I put the computer back together in the case, now I heard a 5 second (hight) beep then it shuts off. According to this site: http://www.bioscentral.com/beepcodes/awardbeep.htm it means that the CPU is damaged or is not seating properly.

Why would it move in the first place, since I haven't touch the inside in a long time? Why the sound now and not when it first occurred?
 
What I saw was
Repeating High/Low CPU
Click to expand...
Thats not a long high beep that's a high and low beeps.
 
More Updated Info:

Today I took the heatsink out and the CPU to see, I put new thermal grease (Artic Silver 5), and put it back. I noticed that when I put it back I forgot to do the last step, which was to fully secure the heatsink into the motherboard the first time I installed it (8 months ago or so). This time I did, but still shuts down after 5 seconds. Also, when I took the heatsink, the CPU came with it, this means that the heatsink was making contact with the CPU all the time, it was super stuck. I used dental floss to detach it, clean it, put new thermal paste.

Also, i uploaded this video in youtube so that everyone can see and most importantly, heard the sound. Its a high sound for 4 seconds, then it goes off smoothly. What kind of a beep sound is it?
http://www.youtube.com/watch?v=x0iC8Mbvypw
The video came out horrible, it cut half the seconds (18s) and it doesn't show when it shuts off. Anyway, you can hear the sound, now imagine that sound thats goes off smoothly after 4 seconds.

According to the manual of my motherboard: http://www.asus.com/products.aspx?modelmenu=2&model=1160&l1=3&l2=101&l3=301&l4=0 I have an Award Bios. Based on the beep sounds recorded on the site above, is suppose to be the CPU, but maybe I misunderstood the sound beep for another one.
 


In your picture that you posted here. It looks like the 2 x 2 power connector to the CPU Vregs is not plugged in.

Make sure that the standard 2 x 12 power connector is plugged in and the 2 x 2 power connector is too.
 
You are getting a lot of good help and advice here. One thing I might add: Whether your components are all mounted inside the case, or if you have your components sitting outside of the case, connected together but sitting on a cardboard sheet or some other insulator, always touch the metal case of the power supply before touching any of the other components. This will dissipate any dangerous static charge you might have built up. The power cord will need to be plugged into a properly grounded outlet for this to work. One small static zap to your mobo, CPU, or any other sensitive electronic item and it can become trash - instantly.

Regards,

Altazi
 

I mention that I tried with another PSU, same results.

I uploaded the sound to a server, I doubt this would help but: http://67.15.157.9/~clanleal/computer_beep.mp3
I am trying to identify the sound of my BIOS chip

Please, help me identify the sound.
I have an ASUS M2N-Sli Deluxe, Award Bios Chip (according to the site).
 
Dunno about the sound, but this issue is very common with the GA P35C DS3R. Most believe it's the mobo's fault, however I believe it's the ram...I think...I hope... Since I have the GA P35C mobo, I seriously hope this doesn't happen to me.

Anyways try changing around the ram with different ones if possible, maybe your ram doesn't like the mobo.
 

My Motherboard Box has the RAM model that I am using on it: http://www.overclockers.ru/images/lab/2006/08/14/nf570/box_front-b.jpg
It says "Corsair XMS2 DDR2 Ready"
I've been using it for the past 8 months, I have tried switching my RAM with the other one separately.

Please, someone help me identify the BIOS beep sound of my Award Chip: http://67.15.157.9/~clanleal/computer_beep.mp3
 
RE : My Computer Turns On For 3 Seconds, Then Shuts Off !!

This may help someone reading this thread.

I had this problem in the last few days after a newly built high end graphics computer, and on first power-on it shuts down 3 seconds later.

Double checked all connections without sucess.

After reading this thread, I worked my way changing PSU, heatsink, PCI cards, HD and the CPU - NO LUCK it still shuts down.

I have noticed that after it shuts down - and with power off from the mains plug - but as I plug it back to power from the mains, it powred on its own and shuts down again.

This, in my case, lead me to the CULPRIT, the new tower case front
ON-OFF button (back spring) was sticking on - ON - !!

So its worth checking it first, even if its a new case.

 
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