Q: Just built PC with ASUS A7N8X mobo first. Press POWER – CPU, case fans u0026 graphics card startup, like hard disks. whirrs everything for about 5 seconds and just close down. Any ideas?
Best Answer: The video card is bad. Switch it out for known good card. Also switch the monitor to a different machine to make sure it isn't the monitor but I'm pretty sure this is the card. Maybe it is still under warranty. Good luck!
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Re:My Asus board did that when I was starting to overclock. I think I set the FSB too high and then it started that. Clearing the CMOS did the trick. Although it took several tries for the clear to take effect.
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Re:When that stuff happens it is true it could be the mobo, ram, cpu, PS, etc.. but if I had to pick one as defective it would most likely be the CPU
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Re:Done that too! I've also checked the case alarm jumper which I see can also prevent bootup
I think I will have to admit defeat and get the dealer to test the board & cpuThanks for your interest and help
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Re:It is highly recommended that after you first insall a new motherboard you clear the CMOS. Read in your manual how to do it. It is usually by moving jumper.
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Re:Dan
Thanks for your suggestions. I'v tried reseating the CPU, heatsink and fan & memory. All seems OK but still no success. Unfortunately I have only one stick of RAM so can't try another. The manual says that there will be POST beeps if it has problems with the memory but the machine shuts down before any beeps/messages at all so the problem must be pretty basic.
Any more ideas would be most welcome!
/Nick
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Re:Bad RAM or inadequate power supply are my first two guesses. Try testing with one stick of RAM (or a different stick if you have only one) see if that fixes things. Also, what is your PSU? If it is not a good one it might not be providing adequate power to your components.
Another thing that comes to me is if your heatsink/fan is not properly installed. Make sure they are or your motherboards CPU Protection scheme might be shutting down your PC to save your valuable parts.
Try reseating everything and make sure your components are tight/seated correctly.
Good luck and let us know if you need any other help.
\Dan
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