Question about HP Pavilion a1140n (PX774AA) PC Desktop

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No power...changed power supply, verified switch is working and connected correctly on the mother board, even verified the power cord is working...I know it's an old machine, is there much more I can check to get this thing working again?

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If you replaced the power supply and its still not working you most likely have a dead motherboard.

Posted on Mar 23, 2011

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Tv has new power supply board and is dead


Have you checked the fuse? Did you verify that the power cord is good (check with multimeter to ensure that it is supplying the correct voltage)?

Apr 19, 2016 | Philips 29PFL4908 29 720p Widescreen LED...

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Model # TH-42PX80U tv was on when a storm hit 'lightning' , on lite only blinks... is it a fuse ? or mother board?


You are better off replacing the power supply board. Usually the mother board will output a power ok signal to turn on the TV only when the power supply is working correctly (all voltages are within specs), similar to a computer, having said so, if you have the schematics you can verify those voltages being output from the power supply upon depressing the power button. The +5v stand by voltage is most likely ok, since the mother board is at least providing you with the blinking light. It is the +12V and +24V which are not being output, along with any other auxiliary voltages. I would suggest either having a replacement board (power PCB) installed or otherwise feeding the needed voltages by substituting those missing ones with a variable DC power supply, just to verify it. Follow above only if familiar with electronics and electricity. safety first!.


http://www.HDalacarte.com guy audio/video/computer technician for over 30 years

May 26, 2011 | Panasonic TH-42PX80U Plasma TV

1 Answer

Bought new power supply, no difference power button will not even go on or light up ; however small green light on mother board lights up. als accidentaly disconnected the switches wiring to the mother...


The green light just show that the motherboard is getting power.
The power button of the front of the case is connected to the mother board, not to the power supply, usually in the extreme lower left corner along with the with the HDD and Reset Button cords; Power button wire are labeled and usually red/black.
If all wired correctly, possible bad or stuck power button or reset button.
Hope this helps.
Please rate this answer by check rating "Hands"

Feb 08, 2011 | E-Machines T3958 (827103050974) PC Desktop

1 Answer

Not able to switch on the mothere board. Green led on the board glows but the system is not powering on.


1. Check the mother board user manual 1st. To see how to properly install this mother boar to your PC cabinet or tower.
2. Check to see if you have the power from the power supply correctly connected
3. You may not have the proper watts or power from the power supply to power said mother board.
4. check the mother board battery it may not have proper voltage it should be 3.9 volts or more with a voltage meter check.
usually a 2025 button battery on the board

Feb 02, 2010 | Intel Computers & Internet

2 Answers

CPU does not turn on..everything is plugged in..power cord is plugged into a working socket. what are my options?


its 2 cable that need to be plugged in from the power suppley, the wide cable and a 4 stick cable. both to the mother board. also you need to connect the fan cable to the mother board. how do you know that the processor doesent start ?

Oct 26, 2009 | Computers & Internet

2 Answers

No pwer


check conections, did you isolated bolts while you ware inserting mother board? check condensators on mother board if there are some leeks... if this is the case ,,, buy a new mother board? is mother board new?

May 02, 2009 | Asrock K7S41GX Motherboard

1 Answer

Compaq Presario v5000 desktop


Is there a power switch on the back of the power supply which is not on? Make sure the power cord is good and plugged into a good power source. Do the fans run inside the system? Is the fan for the power supply working? If not the power supply could be bad. You can purchase a power supply tester to plug the mother board connector into to verify the operation for about $15.00. Do you see any lights on the mother board and the Hard Drive light flickering? If you do and your Key Board lights are on your video controller or monitor could be setup wrong or defective. If the power supply tests good then you need to test the memory and CPU. You could also carefully remove all boards except the video card, mother board and memory and see if it boots up.

Mar 30, 2009 | Compaq Computers & Internet

2 Answers

Power up


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

May 08, 2008 | E-Machines eMachines Desktop PC

2 Answers

No power no light


Could be either one, or it could be the toggle switch.

Start with the easiest first to check. Unplug the power toggle switch from the mainboard and take a screwdriver or something and short out those two pins to see if it starts the pc. if it does, then your pc case switch is just bad.
If that's not the problem, check the power supply next.

Jumper the ATX 20 pin power cable's green wire to any black, just to make sure the power supply is working. The fans in the power supply will turn on along with anything else hooked up.

To jumper the power supply use a section of wire or a bread twisty (with the insulation removed from the ends) and just connect the green wire to any black wire on the 20 / 24 pin power connector. Make sure that the power switch on the back of the power supply is switched on.

If neither of those seem to be the problem, then most likely it is the motherboard or the processor.

Dec 21, 2007 | Dell Dimension 5150 (DIM515MIN) PC Desktop

1 Answer

No boot up screen


Hello.

The mother Board is a possibility, but I think that first I would check the main power supply. It is best to substitute in a known good PS to verify. If a good power supply fails to correct. I would look on the mother board for obvious hot spots or electrolytic capacitors with bulging tops or shrunken PVC outer coverings. Manufacturers have built with defective or incorrectly marked capacitors before. I have repaired several by just replacing the caps that had overheated and started to vent pressure after doming their tops.

Good luck.

Oct 15, 2007 | Acer Aspire T310 PC Desktop

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