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Power up replaced power supply, still won't power up. possible motherboard?

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Does this mean no power at all, or just that the computer won't

Do any of the fans spin ?
Do the hard drives spin up and make noises?
Do any lights come on?
Is the cord OK?
Is the rear power switch in the ON position?
Is the rear voltage selector switch set correctly?
Is the new power supply good?
(don't assume it is)

Perform all changes with power off and cord unplugged (!!!)
Leave a minute or so after power down, to make sure
all the capacitors have discharged.

Touch and Hold the metal chassis with one hand to make
sure you have no static electricity, while handling cables
and I/O cards.

1) Check and wiggle all cables and I/O cards.

Remove and re-insert the I/O cards carefully

Remove and re-insert the memory modules carefully

2) Remove all I/O cards except the video graphics card
Does it power up and post now?

Remove extra memory modules, try just minimum RAM

3) Remove the Video card and see if you get any sign of

Error beeps, fans spinning up, hard drives clicking
and whiring, etc.

Possible causes, with increasing degrees if repair expense:

a) Bad power supply.

b) Bad mother board connection to the power supply or
to the front panel switches.

Check the little ribbon cables.

c) Bad front panel switches.

d) Bad video card, video card shorting the I/O bus

e) Bad memory module, memory module shorting the I/O bus

f) Bad CPU

g) Bad mother board and/or chipset.

On modern mother boards, power supply control and
fan speed control are both integrated into the mother board
and chipsets. Power switch behavior can also be controlled
by the BIOS settings. This means you have to take many steps
to isolate the problem.

Hope this gets you started.


Posted on May 08, 2008

Pull everthing off board but power supply ram cpu and heatsink. then try to power unit.

Posted on May 08, 2008

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See if power supply fan is running. If not....the power supply is bad. Also...see if there are any lights lit on the Motherboard. If not....the power supply is bad. You can pick one up on ebay pretty reasonable. Hope this helps.

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My Cisnet PC has a new motherboard (only been used 5 months) and has froze up on me twice the last won't turn on again unless I let it sit overnight...this last time, though, nothing com

Could be a possible hardware problem. When you say new motherboard, was there an issue with your old one? Were you given the exact same model?

Also, maybe an issue with your power supply.

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You probably and lets hope so, have an Electro Static Charge Buildup on your desktop. Remove the Power Cord and Press and Hold the Power Button for 30 seconds. After 30 Seconds plug the Power Cord back in the hit the Power Button. If it boots then you had an Static Charge Buildup. If it does not boot and you say it happened after a power surge then either your Power Supply or Motherboard is possibly damaged. Do you hear fans, hear the disk drive running, see lights, hear the CD Rom click once and see the light on the CD Rom drive com on briefly after you hit the Power Button. If so it would seem that your power supply is ok.

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My computer won't boot up and the orange light just stays on. The moniter is working, the fans in the power supply is working

Could be your motherboard. Does anything come up on the screen at all when you boot up? Do you hear a beep at startup? Also check to make sure your hard drive is spinning just to be sure.

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My computer suddenly lost power and now it won't even turn on.

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Is there a way to increase the factory maximum ram of 512mb on a Sony PCV RX550. Purchasing motherboard, etc.

The only way to increase memory capacity on any motherboard is by replacing it with a new one that can take more. Rather than do that in your Sony computer, though, you should probably consider replacing the entire computer. Here's why.

First, you may not be able to fit a different motherboard into the Sony case. Many computers were made using proprietary motherboards with non-standard sizes or mounting hole locations. Then, they often have non-standard connectors for the front panel switches and lights, making it difficult to hook up. The power supply will be a problem. Guaranteed it will be too low-power for newer motherboards and won't have the right CPU power output connector, so you'd need to replace that as well. But a standard power supply may not fit into the case; again, proprietary power supplies with odd sizes were often used. So now you're looking at replacing the motherboard and power supply, and possibly the case, just for starters.

You'll need a new processor and RAM with the new motherboard. No new board will support your current processor and RAM. And you'll need a new hard drive and probably optical drive as well. New boards are designed for SATA (serial interface) drives. There won't be enough connectors to re-use the older IDE devices in your Sony.

You'll probably need a new copy of WIndows, too, unless your Sony still has an XP or Vista product key sticker on it. You won't be able to use any factory restore discs because the hardware will be completely different, so you'll be doing a fresh installation from scratch.

The bottom line is that you're going to end up building a new computer. If you just want a basic computer for the typical things like Web surfing and office use, you can buy a name-brand system for less than the price of all the parts, and it will come with Windows installed and will be ready to go. If you're wanting a super gaming machine or something tailored for a specific use, and you're willing to do the work, then by all means pick up the individual parts and roll your own.

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The power on my hp pavilion hl919 won't turn on.

I see this problem with Hp and compaq computers from time to time, and I have a possible solution for you.

The first thing you need to do is unplug the power cord and ethernet cable , if you have one attached.
This stops any stray power from coming into the pc, and is crucial to getting it going again if this works.

Now, after disconnected from that, press and hold the power button in for at LEAST 45 seconds.
This causes the capacitors to dissapate their static charge, as essentially resets the motherboard to a " ready" state.

If you don't hold the button down for that long, the capacitors may not be all the way discharged.

Now after you have held the button in for 45 seconds, you can then stop pushing on it.
Next, replace the power cord, and try to see if it will power up.
If it does, then you can then reconnect your ethernet cable.
If not, then you have most likely suffered a power supply failure.
Now, although the power supply is something that a consumer "can" replace, I really don't recommend it, because if you get even one plug the wrong way, or connected to the wrong plug, then it could burn out your motherboard, and turn your pc into a nice boat anchor!

If you have to get a new power supply, I would take the computer to a certified repair vendor, like Fry's, Best Buy, Radio Shack, Staple's, or CompUSA.
They all have technicians trained in pc component replacement, and on top of that, the repairs almost always come with a repair warranty.

I hope the first thing works for you though, it will save you money, and if it works, will have you up and running in just a couple of minutes.

Good luck to you, and have a good day.

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It is possible that you may have a bad power supply and need to have it replaced, it could also be something simple such a a loose connection on your motherboard. I would start out by removing the power supply from the machine and having it tested at a computer shop. Also make sure everything is plugged in correctly on the hardware. Let me know if this helps please, Jeff from fixya

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My sisters e-machine will not switch on there is no sound from the power suply fan and no light one the on switch

The power-supply or the motherboard has failed.

The power-supply is a "user-replacable" part,
but replacing the motherboard takes a lot more skill and care.

Take the computer to a qualified technician, and ask them to temporarily try a different power-supply. If it works, buy the power-supply, and pay the technician to remove the "dead" unit, and properly install the "new" unit.

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Powering up

Possible that the defective power supply has caused damage to the motherboard or processor. Check replacement p/s for correct operation if its ok problem is most likely the motherboard/CPU which would require replacement

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