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No power in cpu

All the components & wires are connected but there is no power in cpu

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  • ardied2003 Feb 25, 2009

    how can that be? i got this less than a year..

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  • 21 Answers

Check your powere supply may be it damage change your power cable first then change just power supply ok best of luck .

Posted on Feb 24, 2009

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It's my first time build a PC. When I turn on the PC, it turn on and off repeatedly. Nothing show on the screen. Not sure why? Is it possible I connect the Power Switch or Rest Switch on the wrong...


In the manual it should say where you should connect the reset switch and where you should connect the power switch. (see screen-shot below) Usually it is also printed on the board itself. The marking + and - of the power or reset switch are not important, it is only important for the leds.
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Mar 06, 2011 | MSI MSM LGA1156Intel H55uATX 6x...

1 Answer

NO POST CODE OR ANYTHING FROM THE INTERNAL SPEAKER....PLUGGED IN A MOTHERBOARD SPEAKER AND THAT DOESNT WORK EITHER???


If you are getting no post code and it wont boot, that means that one of your core components has something wrong with it ( main components are: motherboard, ram, CPU and fan, or power supply. ). This could be something as simple as a loose connection or a connection that was not plugged in (like the motherboard 20 or 24 wire connector, the CPU 4 wire power connect, etc). This could also mean that one of those main components is not supported by the rest of the system, or one of your main components has gone bad. Usually if its a component gone bad or not supported it would make a series of beeps instead of the one beep post code. Go through all your connections and make sure they are all in place, and on the right place. Make sure thats nothing is improperly grounded. Make sure that your ram is all the way in.
If your PC is still booting like normal even though it does not have a bios code beep, then this can be problems with your case speaker connection or the speaker it self. Sometimes disconnection the components that are not main components and and trying to boot like so might give you a better Idea as to what might be happening. If you have recently added a new component this could be that the power supply cant handle to power up everything (not enough power) so it wont sent the 'power ok' signal to the motherboard and the motherboard in this case will not boot.
Good luck. I hope this helps in some way!!

Feb 15, 2011 | Computers & Internet

2 Answers

MOTHER BOARD NOT POWERING ON


Hi, 

I want you to try first swap the power supply box  of the PC if no change ?
go to the CPU socket remove the CPU check if any component is burnt that area if ok put a new CPU  then on it . 
If still behaving the same ,then the mother board is bad get a new mother board

Good luck  

Oct 01, 2009 | Foxconn P9657AA-8EKRS2H (6938279104065)...

1 Answer

Dell PC won't start


No beeps are heard, no CPU fan is turning on, only blinking yellow light. This brand usually experiences this problem.
  1. First, check the power supply. Disconnect connectors from the board and make a jumper wire for the green wire to any black wire. If the PS fan does not spin then it's busted, else proceed below.
  2. Reconnect connectors except the one with 4 wires, 2 yellow and 2 black, then switch on. If CPU fan turns on then you have a bad processor.
  3. If the fan is still not turning on then check the USB port pins for short circuit.. disconnect it from the board and switch on.
  4. Do the same with other hardware connected to the board.
PS: The metallic casing of computers must be connected to the common ground of the power utility to protect it from stray currents that result to damage of sensitive components such as processors, memory and hard disks.

Sep 26, 2009 | Dell Dimension E521 PC Desktop

1 Answer

Power switch light is on but no other poweris getting through, changed the power supply but same problem. light comes on power button but power supply fan doesn't even come on.


No beeps are heard, no CPU fan is turning on, only blinking yellow light. This brand usually experiences this problem.
  1. First, check the power supply. Disconnect connectors from the board and make a jumper wire for the green wire to any black wire. If the PS fan does not spin then it's busted, else proceed below.
  2. Reconnect connectors except the one with 4 wires, 2 yellow and 2 black, then switch on. If CPU fan turns on then you have a bad processor.
  3. If the fan is still not turning on then check the USB port pins for short circuit.. disconnect it from the board and switch on.
  4. Do the same with other hardware connected to the board.
PS: The metallic casing of computers must be connected to the common ground of the power utility to protect it from stray currents that result to damage of sensitive components such as processors, memory and hard disks.

Sep 26, 2009 | Packard Bell (190169) Power Supply

2 Answers

Yellow light on power button keeps blinking but doesn't boot.


No beeps are heard, no CPU fan is turning on, only blinking yellow light. This brand usually experiences this problem.
  1. First, check the power supply. Disconnect connectors from the board and make a jumper wire for the green wire to any black wire. If the PS fan does not spin then it's busted, else proceed below.
  2. Reconnect connectors except the one with 4 wires, 2 yellow and 2 black, then switch on. If CPU fan turns on then you have a bad processor.
  3. If the fan is still not turning on then check the USB port pins for short circuit.. disconnect it from the board and switch on.
  4. Do the same with other hardware connected to the board.
PS: The metallic casing of computers must be connected to the common ground of the power utility to protect it from stray currents that result to damage of sensitive components such as processors, memory and hard disks.

Sep 24, 2009 | Dell Dimension 5150 (DIM515MIN) PC Desktop

2 Answers

Psu


Hmmm.... mainly you have:
-20 or 24-pins connector, that is unique and goes directly to motherboard (powers motherboard and its components)
-4 or 8-pins connector that powers CPU
-the rest would be connectors for ROM (CD/DVD/BlueRay) and HDD devices (there are: molex and sata power conectors)

If you totaly unshure, there is manual:
Illustrated How to Replace an ATX Power Supply

Sep 05, 2009 | Computers & Internet

1 Answer

Cpu doesnt work


Dear Zalrashdi20,
When you say that the CPU doesn't work, what happens exactly? Does it not power on OR There are beep sounds heard OR there is an error on screen that you would like to share? OR ...

Assuming that the machine is not powering on at all .. here are few checks that you would like to perform...
  1. There is a toggle switch (Voltage selector) at the back of the computer on the power supply unit, just besides where you connect the power cable .. make sure that appropriate voltage is selected.
  2. Try connecting the computer to a different wall socket.
  3. If computer is connected through the Surge protector or UPS then try connecting it directly to the wall socket.
  4. Try using a spare power cable if available.
  5. Remove all other connections apart from Power supply, keyboard, mouse and monitor and see if that makes any difference.
  6. Remove the power supply cord from the back of the computer and press and hold the power button for few seconds .. this would drain the accumulated power from the CPU components .. now reconnect the power supply and see if that makes any difference..
  7. Open the chassis and see that couple of wires run from behind the power button on the CPU to the big circuit board (Motherboard) .. make sure that the wires are properly secured.
Perform these basic checks and let me know and I would glad to assist you further.

Regards,
Srinivas

Jun 21, 2009 | E-Machines (T2824) PC Desktop

1 Answer

Fan wiring


That is absolutely wrong. You cannot wire the CPU fan to the power supply because you will most likely burn the fan out. The power supply (ac adapter) is most likely feeding 19 volts to the motherboard, which is broken down into lower voltages to run various components. The fan may only be a 1.5 or 3 volt component. Fan speed is controlled by the voltage, so it would spin up much higher than it is designed for.

And even if it did work, the fan would not step down or idle at any time so it would fatigue and burn out from constantly spinning at a high speed.

CPU fan failure would almost certainly lead to a cooked cpu, damaged motherboard or both. You should have the machine serviced to repair the fan circuit unless you are willing to risk the loss of the whole machine. It is too critical a component.

May 28, 2009 | Computers & Internet

1 Answer

Hp pavilion 764c wire diagrams


Take a picture of the inside of your computer and put it up on the website with the wire connectors that need to be connected. The connecting wires should be in four groups. 1. The power supply connectors. These connectors will supply power to to all the power using components not supplied power by the motherboard itself. 2 The connections to the other components in your system like the dvd/cd player and the harddrive and floppy drive.3. The motherboard connections for the case. The power switch connector andreset switchconnector. The power led and theharddrive activity light.The USB connector and the audio connector.The fan connections like the cpu fan and other fan only connectors found on the motherboard.The external fans ( Fans that need to be connected to the power supply).Most of these connections are labeled on the motherboard. The case connectors also should be labeled for the correct connection. The best way to find the answers to this hook-up, may be to call HP pavilion with your computer make and model number,motherboard model number including revisions number. Computer made by big manufacturers tend to have may revisions and the only way to make sure your are getting a correct hook-up to the motherboard is call them for assistance.Especially if the motherboard and case labels are not present or so small that they cannot be read.Hope this helps you with your problem.

May 16, 2009 | HP Computers & Internet

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