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Computer not turn on

After a power failure the computer stops working. (Is not turining on.) I install a new power supply and I still have the same problem. The only light that is turning on at the front is the green light. The motherboard model is a Prescott 533

Do you think is a motherboard problem? How I can confirm is motherboard is the problem?

Thanks in advance for your help,

Posted by on

  • cmoraleslodm Nov 13, 2008

    The computer not have any beep. Is not making any soiunds

  • Stellyx
    Stellyx May 11, 2010

    Hi Cmorales,

    before i present a solution may i ask if there are any beeps at all when you turn the pc on?


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4 Answers

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So its either one of two things here.

1- somehow a step was skipped and/or something is just not seated right. My guess would be that its the processor itself (due to the lack of error beeps). You see if the processor was seated correctly and the computer turned on then the PC's BIOS would give you error beeps telling you that somethings amiss.

2- something is damaged and needs replacing. I have assembled hundreds of pc's and i can say with confidence that 99% of the time when the newly created pc does not want to cooperate its because i missed a step or didn't seat/connect something properly.
However there is that 1% that does not turn on due to bad hardware.

I would remove the RAM, the heat sink and any cards that are in the pc and make sure to take my time putting them back in.

If that does not work i would start replacing parts starting with the RAM (#1 thing to fail in my experience they are so fragile sometimes) leaving out the PCI/PCI express cards, and ending with the Processor. try to get a bare bones PC working then work your way up.


I hope this helps and im here for ya


Posted on Nov 13, 2008

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Have you try to remove the heatsink fan? if not remove the heat sinkfan and reseat the cpu, also make sure that the power supply you bought is equal or greater of Watts as the old one. Also make sure that you connected all the wires from the power supply to the motherboard and remove your memory ram and put it back in. Let me know how it goes.

Posted on Nov 13, 2008

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Since you replaced the PSU, I would take all the adapter boards out IE:Video,NIC card, Modem etc.
Then I would take out and reseat the memory. If you have more then one stick of memory, re-install one stick and then power the unit up. If it powers up add the other stick of memory, again see if it powers up. depending on whether it power up , you will know whether the memory is the problem.
If it powers up with the memory installed, then install one card/adapter at a time to see if one of them is causing the problem.
If after following these steps, it still does not power up, then you probably have a bad motherboard or Processor.
Let me know what results.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Posted on Nov 13, 2008

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Open your pc then turnit on and tell me if the master fan is workin,
trying changin RAM too bcoz when the ram is demaged pc cant start
if you have a volt tester u cant test if ur motherboard is getting power or not, if yes It can be possible to repair
if not that mean one of the lil components has burned out

Posted on Nov 13, 2008

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Check the back of the computer. If the power supply has a switch for incoming voltage, make sure that it matches your incoming voltage. Next check that the main power cable (20 or 24 pins depending on the computer) is fully seated on the motherboard. (It can only be connected one way and should lock onto the connector on the motherboard.)

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My computer went blank when turning it on


1) Computer isn't working, due to the Processor isn't working, due to a bad Power Supply.
Weak voltage power rail.

Enough power perhaps to light LED lights, and maybe spin fans, but not enough power to turn the Processor on.

Computer Power Supply's are rated in Wattage.
Volts times Amperes = Watts.
(Average computer power supply in a fairly new computer, is rated at around 300 Watts)

A) ALL of the LED lights combined, use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts.
C) A typical Processor may use 51 to 125 Watts.
Depends on what Processor it is.

Power Supply with a weak voltage power rail, can have enough power to light LED lights, spin fans, but not enough to turn the Processor on.

Solution?
Test the voltages of the Power Supply,

Or, use a KNOWN to be good Power Supply, that has the correct amount of power cables, the right kind of power cables, the correct size, and shape of the case, and enough Wattage, for a test unit..

A bad Power Supply is one of the leading causes of computer failure.

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It all depends how many beeps there were.
From http://h18000.www1.hp.com/products/quickspecs/12253_div/12253_div.HTML
Diagnostic LED Explanation Table Number of 1-second red LED blinks followed by 2-second pause, then repeats:
2-processor thermal protection activated
3-processor not installed
4-power supply failure
5-memory error
6-video error
7-PCA failure (ROM detected failure prior to video)
8-invalid ROM, bootblock recover mode

I have only really come across 4 beeps = order new Power Supply or 5 Beeps = reseat the memory and hope it works

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The green power light on the PSU is on but the machine will not power up PSU is an HP5188-2627. The machine (HP m7580uk) has been on for an extended period of time but was working fine until it was finally...


Power supply failure, or the Power On switch. (Behind the Power On button)

My money's on the power supply failure.

Why?
It's the leading case of computer failure. The power supply is the 'Heart' of a computer. (Processor is the 'Brain', Motherboard is the 'Building Block')

Computer was on for an extended length of time? Was the computer ever turned off, and the inside of the computer cleaned out on a regular basis?
(Power supply also)

Normal procedure is to unplug the computer from power, open the computer case, and use a can of compressed air for computers.

Power supply light is on?
This is what is going on.

Computer power supply's are rated in Wattage, for power.
Voltage times Amperage = Wattage

The HP 5188-2627 power supply, supplies three main voltages. It has three main voltage power rails.

1) The 3.3 Volt rail
2) The 5 Volt rail
3) The 12 Volt rail

Your power supply has a weak voltage rail.

A) ALL the lights use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts
C) A typical Processor uses 55 to 125 Watts.

There isn't enough power from the power supply to turn the Processor on.

Solution is to replace the power supply.
It may seem a little daunting for someone replacing a computer power supply, the first time.

After you have replaced one, it becomes easier.
Essentially you are just opening the computer case, unplugging the power cables from the power supply to the various hardware components, and removing the power supply.

To install just reverse these steps.

The power supply in your computer is a 300 Watt power supply. (Maximum wattage)

The size, and shape of the power supply, is one that is used in over 90% of personal computers.
ATX

What I would I recommend for a replacement?
Not one of the cheap quailty Hi-Pro's that HP used, that's for sure!

An OCZ StealthXStream 400 Watt is what I would recommend.
Why?

1) It will fit
2) It has a 140 Millimeter fan compared, to the 80mm fan that your old power supply has.

A larger fan means it will run quieter, due to the fact that it won't have to turn as fast, in order to put out as much air.
Will actually put out more air than that 80mm fan, and will spin slower.

3) Has two 12 Volt power rails.
One 12 Volt rail can deliver 17 Amps.
The other 12 Volt rail can deliver 14 Amps.

You can add the two 12 Volt power rail Amp's together, for 31 Amps.

Means less strain for the power supply, to keep up with the tasks.
(Your old power supply probably has an 18 Amp, 12 Volt power rail)

4) Has all the power cables you'll need.

5) Price, and reliable quality.

This is one place that carries them,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4675269&CatId=1078

There are other places also. Not advertising for the above website, nor the power supply manufacturer.
Just my personal preference, based on experience with both.

A computer only uses the power it needs, and NO more.
If you install a 1000 Watt power supply in your computer, and the computer only needs 100 Watts, it only uses 100 Watts.

(Surfing the internet typically uses 100 Watts of power. Like a 100 Watt light bulb)

This may help guide you in replacing the power supply,

http://www.hardwaresecrets.com/article/362

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