Computer turns on when plugged then turns off after 2 seconds

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romnick022

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Hi Folks,

I hope you can help me for what is going on in my rig (just assembled)
When I am plugging the AVR to the 220v outlet, Chassis fans and CPU Fan turns on for 2 seconds, Motherboard light turns on as well and then turns off. No boot yet. Just flashing of Led Lights. Back to normal when switch on thru the power button.

I wonder what causes this, I did reset and disable power function at Bios. I believe all is working well aside from this thing.

I am just afraid of a wrong configuration or something worse will appear in the future.

Here are my specs:

CPU- intel i5 3570k
Mobo - DH77M01 CY0629 from Dell XPS 8500
HDD - 320GB Samsung HDD
GPU - GT 630 1GB GDDR5
PSU - Antec NEO 520w
generic casing

Thank you so much for the help!
 
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aquaprofile

aquaprofile

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can I ask what Cpu cooler youre using?
 
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romnick022

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Sir, I am using a deep cool Ice Blade Pro and a deep cool thermal paste on it!

BTW, this was actually my 2nd board, the first one (the same model) I returned it to the seller, and requested a new one and the same result happened.

Thanks for the reply!

 
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aquaprofile

aquaprofile

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Hm. My motherboard will try to boot for 1-2 seconds and shuts off if no Cpu_fan RPM is detected. is your Cpu fan header plugged in correctly and all? and is the fan working (quickly tries to start for a second?) Also maybe you have a case speaker to test with? You can get them for like $2
 
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romnick022

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Actually, there should be no boot first at all because I am not yet turning on the PC.

this scenario happens when I am plugging in the PC for power outlet. I am not yet turning ON the pc so my expectation should be no response yet or a power Led light only on the Monitor...

CPU shouldn't be responding yet... (which makes this is weird)

To your question for the CPU fan, I guess I assembled it thoroughly.

P.S.

I tested this on a different CPU case and had the same result.

I am suspecting the board, and my configuration.

Thanks for the reply aquaprofile =D
 
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aquaprofile

aquaprofile

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Id get a case speaker. It will give you a sequence of beeps that can be very nifty to kill off a problem.
 
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akseli

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Oh that's perfectly normal for most computers.

It happens only when the power is phycially connected, the motherboard "powers up" until it reaches operating status and desides, that under default settings, it should not boot. It's not actually booting, the power it delivers to fans just gives that impression. In booting, the HDDs would spin up, but I've never seen a computer to do that when connected to wall.

Then it disconnects power from most stuff, leaving usually just one idle light visible on the motherboard itself. Normal status of any computer, is to have minimal "standby" power, so that when turned on, it can boot. Most models I've seen, have no other light visible, but I guess some models or cases might have a standby light in the front panel, indicating the computer has the minium power and it's ready to boot if required. Some power supplies may have a light or two to indicate roughtly same.

"stanby" above, is not the right word, because when computer is in standby, it actually refers to the state where the computer has power, it has been booted, and has been fully operational, and the contents of the memory is kept because it has power, only the CPU and peripherias are temporarely shut down.

But I refer to "standby state" similiar of any other device. For example like a TV, when it's on standby, it has minimal power so that it can turned on by remote. Or a recorder on normal standby state, can turn on and record a show as programmed. Normally all devices have such a standby power. They are not actually "on", they just have the standby power.

But in computers, standby refers to sleep state the computer has been temporarely entered. Nowadays it's called sleep mode to avoid confusion, but unfortunately the old use of standby is still in use.



Go around, disconnect any computer for few dosens of seconds and they should all behave like that when connected by again. They will retain the standby power for few seconds when disconnected, so it has to be longer.
 
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synphul

synphul

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I would agree with akseli, I've had systems do that before. Motherboard receiving power when a system is first connected to wall power (or in this case avr). It doesn't attempt to boot, it just does a quick power up of the fans for a couple seconds then goes back to being 'off' waiting to be turned on via the power switch on the case. After being initially plugged in it shouldn't do that anymore and power up/power down as normal. Most people don't plug a system in very often so may not notice it. Unless the system goes into a startup/shutdown boot loop or has trouble powering up to post/boot when pressing the case power button or anything it's perfectly normal.

When it's first plugged in the psu has absolutely no power going through it. Once the capacitors and things are supplied power the psu will maintain wall power in a 'ready' state to power the system once the case switch is turned on.
 
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romnick022

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akseli & synphul : thank you so much for the help!

i just wonder since it is powering up and turns off - it would hurt my other peripherals? Would that be possible?

If this is fine, tell me I have nothing to worry about! =) Thank you so much for the help guys!

 
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romnick022

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actually, It already has a motherboard speaker! =)

 
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