Question about HP Pavilion 7955 PC Desktop

1 Answer

Computer won't start The voltage switch on the power supply was accidently changed to 230. Is it fixable

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • HP Master
  • 11,800 Answers

Most likely not, the power source is dead, replace it. It's a standard ATX source, any 400W one you can buy from all IT shop will do.

Posted on Apr 25, 2010

Testimonial: "Hopefully the power supply is the only thing fried"


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

My psu not working at all for desktop even to run the fan

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

May 02, 2011 | Compaq (176763001) 120-Watt Power Supply

1 Answer

Is there more than one power switch on my dell inspiron 531S? I was working on my computer and then suddenly poof! No signs of life. Monitor working but no computer. I have tried checking power surge...

Hi, Thanks for using fixya.

Check the 230/115 switch if it is on the right voltage then I would change the power supply. Sounds scary but very easy to do. They run as cheap as 10-20 bux.


Feb 12, 2011 | Computers & Internet

1 Answer

The fuse is intact but there is no output voltage

Is the 115 / 230 volt voltage switch in the back of most units in the proper position for your country's voltage? Also, are the wires from the on / off switch on the computer tight, in the proper place. Some use a direct on / off switch that breaks the mains line directly, some use a small momentary push switch that activates a switching circuit on the motherboard.
Just some thoughts.
Good Luck.
Jeff Mc.

Feb 03, 2011 | HP PS62413CF 240Watt Power Supply

1 Answer

On the back of this power supply, Theres a red switch with the numbers, 115 and 230. depending on which way it was switched on. Can someone please explain to me what this is?

Hi inforis,
That is a setting that will change the voltages, and you do not want to flip that switch. If you do there is a chance you will fry your computer. Different countries use different voltages. It's cheaper to make a switch & some circuits inside the PSU than make a whole new one. List of countries with frequency & voltage (
Hope that answers you question well enough.

Dec 29, 2010 | HP ATX-300-12Z (ATX30012ZBD) 300-Watt...

2 Answers

Keep burning power conversion plug on PC board I am running unit at 230 volts I have change transformer also

You should first start with converting the unit to run on 115 VAC if you can. We had a unit that went thru three ignitors, 2 selector boards, two main boards and a transformer in one summer in part because the electronics in that model are sensitive to spikes and spikes on a 230 circuit are worse than the same spikes would be wired for 115. Jandy was the source for that recommendation, not us.

Anyway, consider changing the line voltage and thoroughly inspect your main board to be certain it is not damaged. Assuming the main PCB is ok your best bet with a new part should be low voltage. Since we converted the unit we were working on it has been trouble-free.


Oct 26, 2010 | Jandy Lite 2 Natural Gas Pilot Light...

2 Answers

Ok i neeed help!!!!!!!! on my power supply there is a switch which you can move to 115 volts to 230 volts. everytime i switch it to 230 volts the computer wont turn on? why is this happening? when i put it...

This is the power supply for your PC, depend on your local country power supply, some country like North US may use 110 V in their daily use electrical stuff and some country like Euro, UK use 240 V.

Your PC power supply is design to suit this 2 type of power input so can be sold everywhere. What u need to do is to make sure your local country power supply voltage and then just switch the input correctly, i think u have done it.

YBC (/\)

Oct 20, 2009 | Computers & Internet

1 Answer

What does the red switch on the back of my dell dimendion e510 do

Don't! That's for foreign voltages. It should say 115 and 230. The 115 is for 120V systems while the 230 is for 240V systems. The actual voltage you get is usually a little less than ideal, so they design power supplies to accept a lower voltage.

Jul 25, 2009 | Dell Dimension E510 Dual Core 2.8 Ghz...

1 Answer

Bose lifestyle 28 no power

There's no easy way to put this. This media center will need a repair. If you know the outlet works, and the power supply works. It couldn't be anything that's easily fixable. Make sure you don't have a dual-voltage power supply (red switch for 120v/230-240v). If so, change to 120v for us power. Otherwise this is pretty straight forward. You can call bose for a repair- 800-367-4008. $165 + tax flat rate. New 1 year warranty.

Jun 20, 2009 | Bose Lifestyle 28 System

2 Answers


Hi, you can almost bet anything that your voltage regulator is at fault. It sounds as if this needs time to build enough resistence to reach the 240 volts required by your computer's PSU.
Change this unit and you should cure your problem.
Question, Why do you need to use a voltage regulator?
Are you running on home generator power?
If you run on mains regulated power then replace the voltage regulator with a power surge protection board.
Regards mistyman

Nov 06, 2007 | Computers & Internet

1 Answer

Power supply

Usually this will damage the power supply only. To make sure your that your motherboard is working, try to find a working power supply unit and connect it. If it does not work your motherboard may be get damaged. Also check for warranty. If your system contains a graphics card, check that too, it may also get damaged with voltage variations.

Oct 02, 2007 | ASUS P5LD2 Motherboard

Not finding what you are looking for?
HP Pavilion 7955  PC Desktop Logo

Related Topics:

116 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18411 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 3 Expert

538 Answers

Are you a HP Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides