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Computer turns on and then right off

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February 29, 2012 11:39:06 PM

It makes a short beep but it turns on and then right off. It is a brand new computer custom built, i have checked the cables on the parts, what else can it be?

Specs

MSI H67MS-E43
Intel Core i5-2500
CORSAIR TX650
CORSAIR 4GB DDR3 1333
SAMSUNG 22X DVD Burner SATA Model SH-222BB/BEBE - OEM
EVGA 01G-P3-1460-KR GeForce GTX 560
Seagate Barracuda Green ST1500DL003
COOLER MASTER HAF 912

More about : computer turns

March 1, 2012 12:38:41 AM

Those post beeps are giving you an error telling you it's a part not plugged in correctly or a failed part.
Check your Motherboard manual for information regarding the beeps.
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a c 122 B Homebuilt system
March 1, 2012 5:12:13 PM

First, look at this:
http://www.tomshardware.co.uk/forum/274745-13-step-step...
to make sure you did not overlook something simple.

Second, work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

Third:
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.
http://www.tomshardware.com/forum/261145-31-read-postin...

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. At this point, if you do not have a system (internal case) speaker, you really need one.


Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps, LED's, or fan activity:

Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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March 1, 2012 8:18:57 PM

The beeping i found out is not the computer speaker it is the hard drive, if i take the computer speaker out it still does it, if i put it back in and remove hard drive or just remove the hard drive no beep. As for the rest of the stuff i have tried it all except for the breadboarding because it does not seem safe to me.
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March 1, 2012 8:31:26 PM

If you aren't getting the computer to power on completely it may be the PSU.
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March 1, 2012 8:34:07 PM

Right, it is powering on, but then just turning right off.
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March 1, 2012 8:44:54 PM

Waterloo9 said:
Right, it is powering on, but then just turning right off.


If you have another PSU, friend who has one, or a computer store that will let you test another PSU, I would go that route, as I've seen plenty of PSU's give just enough power to make things come on and fans spin before turning off.
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March 1, 2012 8:48:54 PM

You mean the power supply is bad not that there isn't enough power right? The powersupply i pick should be plenty for that build right?
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March 1, 2012 8:52:45 PM

Waterloo9 said:
You mean the power supply is bad not that there isn't enough power right? The powersupply i pick should be plenty for that build right?


Yeah, that should be more than enough, some are bad in a sense where they just don't supply what they are rated for, or have other issues keeping them from supplying a steady voltage to power the system completely. So yeah, I'm pretty much saying that it sounds like a bad PSU. If you can test this in some way with either another PSU or with a Volt/amp meter then that would be your best bet.
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March 1, 2012 9:04:56 PM

As of right now it is booting up and staying, i put the memory stick in the last slot and it worked.
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March 1, 2012 9:17:56 PM

Waterloo9 said:
As of right now it is booting up and staying, i put the memory stick in the last slot and it worked.


Usually something like that would give a beep error code. Make sure to turn it off and on one more time to make sure as you may have just got lucky.
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March 2, 2012 12:00:15 AM

It did, getting windows now.
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March 2, 2012 12:10:01 AM

Waterloo9 said:
It did, getting windows now.


Congrats, hope all goes well.
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April 13, 2012 6:11:07 PM

So the problem was a memory or a memory slot? Has it worked before?
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