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Sony desktop computer reboots on power up

I have no0 -5 volts on my sony computer and when i turn it on it reboots. Is the power supply the problem?

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Yes replace the power supply might solve your problem

Posted on Feb 13, 2009


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How to fix couple of DELL desktops where I plugged them into 220 volts Power supply when they were set for 110 volts? More details below.

you could try replacing the power supply. if it still does not work, you probably fried the processor or motherboard. (or both). just make sure the replacement power supply has the same type of connectors on the power leads to the motherboard, hard drive, etc.

Aug 15, 2015 | Dell OptiPlex Computers & Internet

1 Answer

My computer turns off automatically with light on keyboard and motherboard

HP Compaq dx2300 Desktop PC?

90 percent of desktop computer failure, cab be attributed to;

A) The computer is dirty inside, to include the Power Supply.

B) The Power Supply is bad

Suggest you start with cleaning the inside of the computer out, but suspect the real problem is the Power Supply.


Because the CD-ROM is not working.


Your Power Supply converts your household/business AC electricity, into 3 low main DC Voltages.

Depending on your country;
USA = 120 Volts AC
Europe = 220 Volts AC
Australia = 220 Volts AC
Japan = 100 Volts AC

This is converted into 3 low DC Voltages for the computer;

A) 3.3 Volts (DC)
B) 5 Volts (DC)
C) 12 Volts DC

Each of the above is a voltage power rail.
The amperage for each power rail is stated on a label, on the Power Supply.

Voltage times Amperage = Wattage

Again, Voltage x Amperage = Wattage

All of the amperage of the voltage power rails are combined, (Added together), to equal the maximum Wattage, the Power Supply will deliver.
This should be stated on the Power Supply label also.

A) IF, all of the LED lights were on at once, they would use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts of power.

C) A typical Processor can use 51 to 125 Watts of power.

[ Intel Pentium Dual Core E2160? Can use up to 65 Watts, ]

You press the Power On button. This in turn presses against a Power On switch,

This in turn, activates the Soft Power On feature of the Power Supply, and turns it on.

The first chipset to receive power is the BIOS chipset.

The BIOS program looks to see what devices are connected, does a Ram Memory count, turns the Processor on, then hands the computer over to the Operating System.

[ Windows XP and Windows 7, are two examples of an O/S ]

Primer over.

Your Power Supply provides enough power to turn the Processor on, then falls to it's knees. Doesn't have enough power to keep the Processor on.

[ A typical CD/DVD drive requires 15 Watts of power. It isn't there when all of the other hardware needs power first ]

Suggest you find a Power Supply that is KNOWN to be good, and COMPATIBLE, for a test unit.

Or you can test the 3 main voltage's coming out of the Power Supply, with a Multimeter set to DC Voltage.

Or you can just replace the Power Supply.

I would prefer you test with another unit, or test the voltages, before you spend your hard earned money.
It's up to you.

Diagnose the problem first. I could be wrong with the above, but if you diagnose using a test unit, or test the voltages, we will know whether the Power Supply is the problem.

Always start with the power First.

Perhaps there is an unused computer you may have access to, and can borrow it's Power Supply for a test unit. Has to be KNOWN to be good, and has to be COMPATIBLE.

What is Compatible? Means it has to have at least the minimum power cables, and the Power Supply must fit in the computer case.

(It is an ATX power supply)

Need recommendations for a Power Supply, post in a Comment.
Also will step by step guide you in replacing.


May 20, 2012 | HP Compaq dx2300 Microtower - RT950UTABA...

1 Answer

I accidentally plugged computer avr 220v to 110 could it affect my power supply

If the computer power supply is a 240 volt unit and you plugged into 110 volt mains the the computer should be OK.
Some power supplies have a voltage selection switch on the back of the power supply switch to 110 volts and it should work.
If the power supply is 110 volts and you plug it into a 240 volts mains then you will damage the power supply and possibly the computer as well.

Mar 14, 2012 | HP Pavilion a465w-b PC Desktop

3 Answers

I have a desktop PC that when I turn it on it will power up and then after 6 seconds turn back off.

The first solution is right on the money, It's the video card, or many of us today forget to plug the damm thing in and the computer doesn't read and we think that there is a serious problem. If none of this helps then try troubleshooting through this PC repair guide. Hope this helps.

Dec 29, 2011 | E-Machines eMachines Desktop PC

1 Answer

Due to an electrical outage,desktop computer (Sony Vaio VGC-RB30), lost power and would not reboot. A small blinking green light on the back panel was the only thing happening. Is this a hard disc problem...

this usually mean the power supply went bad and is in safe mode.(so other component in the computer won't get damaged) try unplugging the computer from the wall and wait 10 minutes. If you plug it in and the green light is still flashing the power supply is the most likely thing that is wrong. you can take the power supply to a local repair shop and they can test it in a few seconds. my guess is that it is bad. (please rate)

Dec 21, 2010 | Sony VAIO RB30C (VGCRB30) PC Desktop

1 Answer

I have a Dell Dimension 5100, after a power outage yestarday, the computer doesnt want to turn on. there is a green light in the motherboard that stays green for as long as i have power conected to the...

The greenlight is probably the UPS [Uninterruptible Power Source]. If the computer was shut down by a normal windows shutdown and the UPS remained plugged into the 120 Volt line and the computer's power supply plugged into the UPS and the UPS NOT turned off, there would still be 5 volt standby voltage applied to the computer's motherboard. ATX type computers never go completely off unless the power supply is turned off or unplugged.
That 5 volts would have to on steadily for the rest of the voltages from the supply to turn on.
If there is a reset button or on off switch at the back where your power cord plugs in toggle it back and forth. You can also try disconnecting the power supply and holding the power button in for about 15 seconds to discharge power.Leave it unplugged for a few minutes. Then try powering it back up again. If those don't work then you might have a bad power supply. They are not hard to replace.
Hope it helps

Nov 20, 2010 | Computers & Internet

1 Answer

I have a Sony VAIO VGC-RB43 desktop with a Bestec ATX-300-12EB3-Rev.S3 power supply. The computer will not power up. The fans will not come on. Measuring DC volts on pin 9 (purple) of the mother board ATX...

Open the power supply case (be careful due to high voltages within the power supply) and look for swollen (tops are domed) or burst capacitors (tops have cracked open due to excessive swelling and the electrolitic fluid has leaked out). We have found this to be a regular problem for systems that have been running constantly for a long period of time. Also, look at the power caps on your mainboard (big ones nearest the CPU) and check for swelling or bursting. I just had tis issue with a Sony Vaio in that the caps in the power supply had started to swell. The system continually rebooted. Have seen the caps on MB's burst as well.

Jun 23, 2010 | Sony Computers & Internet

2 Answers

Pcv- rx860 desktop will not boot when power button is pressed, blue light blinking - could it be the power supply? tried re seating hard drive, memory and video cd

I also concur that the power supply is at fault.
Weak voltage power rail.

1) You can check the voltages of the power supply with a power supply tester, (One example:

2) You can also check the voltages with a multimeter.

There are three main voltages produced by a SMPS.
(Switched Mode Power Supply. However the 3.3 Volt power rail is being phased out)

A) Wires with Orange insulation are 3.3 Volts
B) Red insulation 5 Volts
C) Yellow insulation 12 Volts

D) Black insulation denotes a Ground wire. ANY Black wire is a Ground wire. Granted not a power wire, but needed to be stated here with the power wires.

All power cables unplugged inside the computer, power supply still attached to computer case. Power supply is turned on, and the voltages are checked.

Multimeter is set to DC, and the 0-50 Volt scale if applicable.
The Positive (Red) probe lead of the multimeter is connected to a power wire.
The Negative probe lead is connected to ANY Ground wire.

The Voltage power wire of most concern here is the 12 Volt wire.
11 to 13 Volts is okay. Less than 11 volts it's time for a new power supply.

Apr 03, 2010 | Sony VAIO Digital Studio PCV-RX860 PC...

2 Answers

Hello i have a Sony Vaio PCW-W2 that i brought to canada from uk. how do i switch voltage to 110?

u can find voltage converter connectors......try using that....u can ask for travel adapters....hope u find them

Mar 08, 2010 | Sony Computers & Internet

3 Answers

CPU fan runs at high speed and won't boot

Change the setting in the BIOS menu. reboot your computer.. when you see the dell logo.. press F1 (or F2 if F1 doesn't work) button until you see the BIOS screen. Check for fan options and change it

Jun 20, 2009 | Dell OptiPlex GX520 PC Desktop

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