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MY Custom PC turns on for a bit thn shuts off!!

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December 27, 2013 1:36:17 PM

When I turn the power supply on the fans and lights I have in will start then shut off after about 3 seconds or so. I dont even press the power button on the case only flip the switch on the power supply. The green LED lights up on the motherboard and I have no idea what to do. This is my first build and I really need help. THANK YOU!!!
December 27, 2013 1:40:21 PM

Could be anything really. What are your specs? Are you sure you have everything hooked up properly? Do you have a system speaker hooked up, and are you getting beepcodes? Does your motherboard have a the Load Code display on it?
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a c 126 ) Power supply
December 27, 2013 1:42:02 PM

After three seconds? A short-circuit would probably shut it off instantly. Make sure the HSF is properly mounted on the CPU. It could also be shutting off because the CPU is overheating.
Re-reading your description, it is also possible that the power switch on your case is shorted closed. If it's a low-quality case like Apevia, maybe a factory drone put a screw through the power-switch wires, as happened to me some years ago.
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December 27, 2013 1:43:51 PM

Jaime3d said:
Could be anything really. What are your specs? Are you sure you have everything hooked up properly? Do you have a system speaker hooked up, and are you getting beepcodes? Does your motherboard have a the Load Code display on it?


I didnt mean to pick that as solution I clicked on that by accident. My specs are
RAM-Corsair Vengeance
PSU-Corsair CX600m
CPU- intel i5 3470
GPU-Gigabyte GTX 770 2GB
MB- ASUS P8H77-I
HD-Western Digital blue 1tb
Case- bitfenix prodigy
Information about power supply cables and connectors
This page has detailed information about the various power connectors and adapters which are there in power supplies. The person who is building his first PC will definitely find this information useful See full content
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December 27, 2013 1:47:09 PM

Double check your memory is seated properly as well as your cpu. Make sure the the motherboard is secured properly to the case as well. Disconnect anything that is not needed to power on such as HD, CD/DVD, Extra fans, or any add-ins. Only have CPU, PSU, and memory and see if you can get it to post. Also, check the MOBO manual and do a CMOS reset just to be safe. You can try getting the system to post with just 1 stick of memory as well. Once you get it to post then you can add items and see if the problem is solved. You can even try updating the BIOS lastly.
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December 27, 2013 2:02:31 PM

Okay, I just re-read your post. It sounds like you haven't even tried to turn it on? It's completely normal for your Asus motherboard to go on for 2 or 3 seconds and then shut off after it's connected to a power source. At that point, you should just be able to turn it on and it goes.

If you get the same behavior when you try to turn it on, make sure you have power connected to the motherboard on the 4-pin power connector next to the CPU.

If you still have issues, your goal should be to get to a BIOS loading screen. Disconnect everything of importance, including HD. Also, use your integrated graphics, so remove your GTX 770.

I would start first with your RAM (If I remember correctly, I saw a similar issue with an Asus MB that had a bad RAM slot). If you have multiple RAM chips, try to only use one, then use the other. Then try a different slot.
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Best solution

a c 126 ) Power supply
December 27, 2013 4:00:49 PM

mydadslegs said:

I didnt mean to pick that as solution I clicked on that by accident. My specs are...

I have unset it for you, so you can select the Best Answer once it has been found.

Disconnect the front panel power switch. Does the machine still turn on when you turn on the PSU switch? Bad RAM, graphics card, or drive(s) might cause the machine to NOT turn on, but to come on by itself suggests a short somewhere on the motherboard. If not, short the power-switch pins briefly with a screwdriver and see if it turns on and stays on. If it does, the power switch is probably shorted closed.
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December 27, 2013 7:30:50 PM

Onus said:
mydadslegs said:

I didnt mean to pick that as solution I clicked on that by accident. My specs are...

I have unset it for you, so you can select the Best Answer once it has been found.

Disconnect the front panel power switch. Does the machine still turn on when you turn on the PSU switch? Bad RAM, graphics card, or drive(s) might cause the machine to NOT turn on, but to come on by itself suggests a short somewhere on the motherboard. If not, short the power-switch pins briefly with a screwdriver and see if it turns on and stays on. If it does, the power switch is probably shorted closed.

Well yes there sir or ma'am the problem was the power switch and I have now gotten that to work but now it wont post. My mate says its becuase I am using a 19' HD tv but I don't know about that. Everything seems to be running very nicely, lights are on fans are moving and I have no idea what it could be. I certainly hope its not a bad motherboard. Any suggestions would be greatly appreciated. Oh and thanks for deselecting it as the best may I ask how you did that.
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December 27, 2013 7:59:29 PM

Onus said:
mydadslegs said:

I didnt mean to pick that as solution I clicked on that by accident. My specs are...

I have unset it for you, so you can select the Best Answer once it has been found.

Disconnect the front panel power switch. Does the machine still turn on when you turn on the PSU switch? Bad RAM, graphics card, or drive(s) might cause the machine to NOT turn on, but to come on by itself suggests a short somewhere on the motherboard. If not, short the power-switch pins briefly with a screwdriver and see if it turns on and stays on. If it does, the power switch is probably shorted closed.

I got it to get the boot logo but it still wont post or go into bios
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a c 126 ) Power supply
December 27, 2013 8:25:45 PM

How have you connected your TV? How do you get to the BIOS screen? Make sure it is set to recognize USB devices like keyboards before the OS loads.
Reset the CMOS to default.

As to the unset, in addition to our banhammers, Moderators are also issued special long-handled bit-brushes that can be used to toggle various settings. They got their name from a practice dating from the '60s or '70s where people with mainframes had to call in consultants every now and then to brush the wear-out bits to keep their systems operating.
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December 27, 2013 9:55:42 PM

Onus said:
How have you connected your TV? How do you get to the BIOS screen? Make sure it is set to recognize USB devices like keyboards before the OS loads.
Reset the CMOS to default.

As to the unset, in addition to our banhammers, Moderators are also issued special long-handled bit-brushes that can be used to toggle various settings. They got their name from a practice dating from the '60s or '70s where people with mainframes had to call in consultants every now and then to brush the wear-out bits to keep their systems operating.


Yeah man I got it. I was on the wrong HDMI setting on the tv (of course its always the simple stuff) and then I got the ASUS logo but couldnt figure out how to get to bios becuase what I was reading said it would go right to it. Since I was in HDMI the part telling me to press delete was cut off quite a bit but I got everything all set. Thanks for the help really. You know Toms Hardware is a pretty fantastic site.
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