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When i press the button to switch it on nothing happens

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Check whether you power supply socket actually has rated supply. Check the fuse or your plug/socket. If all this is ok, your SMPS is faulty

Posted on Dec 18, 2008

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Pc doesn't start up

If nothing happens at all it sounds like a power problem, check the fuse in the mains plug, check for an on/off switch on the back of the computer, if neither of these are your problem then it may be a faulty power supply or simply a faulty switch on the front. Hope this helps.

Mar 03, 2013 | Computers & Internet

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Compaq Presario SR1050NX Won't Turn On. . .

You're typing like you have been working tirelessly on the problem.
In fact there is no user name, lol!

Okay.....relax...........just ease back, and put your hands behind your head, and close your eyes.............think about clouds floating across in the sky.



Your Power Supply is bad. Weak voltage power rail.
Replace it.

Don't think so? Cool.

That's what I'm here for. To teach.
Have a multimeter?

A) If ALL of the LED's were on 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. Just depends on what Processor it is.

(Older Intel Pentium I, II, and III, uses less than 51 Watts. Some older AMD's do also)

You press the Power On button. The plastic assembly of the Power On button in turn presses against a Power On switch,

The Power On switch is a Momentary Contact Switch.
When briefly closed the Power On switch completes a circuit.
The Soft Power On circuit.

When the Power Supply is plugged into power, there is a constant 5 Volts (DC) present.
The 5 Volt Standby power.

Pressing the Power On button redirects the 5 Volt Standby power, in the Power Supply. This 'excites' the Power Supply, and turns it on.
(Soft Power On circuit)

The first chipset (I.C.) to receive power is the BIOS chipset.
The Basic Input/Output System program is initialized.

BIOS looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.

(WinXP and Win7 are two examples of an O/S)

Primer over.



FOLLOW Anti-Static Precautions


(Yes, I know. Slightly different computer case. Principles still apply)

3) Don't think you will be hearing any BIOS Beep Codes, because there isn't enough power, lol!

For additional questions please post in a Comment.

(If Power Supply power were dynamite, your Power Supply wouldn't have enough power to bl-ow it's nose)

Aug 28, 2012 | Compaq Presario SR1050NX (DW257A) PC...

1 Answer

After a power outage my tower wil not turn on. when I press the button nothing it locked? how do I fix this. I unplugged and re pugged.

just remove the power plug from the back of your comter and press the powerswitch few time then plugin the power cable and press the power switch

Sep 01, 2011 | HP Computers & Internet

1 Answer

Computer turn on, but when it does it won't POST

It seems like a motherboard issue. It heats up, thus is not able to turn on continuously. You may need to check internal parts embeded on the motherboard llike the fan and processor before you could know what needs replacement.

Jul 18, 2010 | Dell Dimension E521 PC Desktop

1 Answer

My hp pavilion a1224n desktop pc will not power up. The power supppy does show a green light on the back but the pc does nothing when I push the power button


I don't know if you tried this, but there should be an on off switch on back of your desktop, which is the switch to the power supply. If you haven't tried it yet, check and see if the switch button on back is in the on or off position. If you are not sure, then press the switch in the opposite direction, and then press the power button and see what happens.

Mar 27, 2010 | HP Computers & Internet

1 Answer

I pressed the on/off button and nothing happens ive unplugged it and plugged it in and still nothing

Your getting nothing at all.
Do you have an on/off switch on back power supply, if so make sure that is switch to on.

If that was not the problem then unplug the pc for a good 10 minutes.
If it still does not power on then my opinion would be you need a new power supply.

Jan 27, 2010 | Gateway 710 X PC Desktop

1 Answer

When the power button is pressed, nothing happens.

Time to open it up and find the connector with Pwr on switch, also rst switch and speaker and leds. With switch on and power connected, short out the pwr-on sw. If this doesn't work, unplug devices using the supply and try again to turn on supply. No Luck, change supply.

Nov 07, 2009 | Gateway 500GR PC Desktop

1 Answer

System turns on however hard drive will not cycle nor will mouse or key board activate

Turn power off and unplug power from computer.
Unplug printers,backup drives and speakers.
Open case and unplug power supply from the board.
plug power cord back in press the power button.
Of course nothing will happen.
unplug power cord again.
plug power supply back into the board.
plug power cord backup and press power switch.
If nothing happens unplug power cord again.
pull out your memory sticks and plug cord back in and press power button.
Of course not much will happen.
But really something is happening to your computer so continue.
Pull power cord and replace memory sticks.
replace power cord and press power switch.
Continue this pulling out pci cards one at a time until you find out what the problem might be.
Try different keyboards and mice too.
Good Luck

Oct 27, 2008 | Intel Computers & Internet

1 Answer

Power switch does not turn computer on

If the switch has a (O) and (I) on it ,the (I) should be pushed in.

Jan 10, 2008 | E-Machines eMachines Desktop PC

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