Question about HP Pavilion 523n (P9851AR#ABA) PC Desktop

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HP Pavilion 523n will not turn on

When I plug it in, the green LED light on the power supply lights. When I attempt to turn the computer on, the fan starts then stops and the light goes out. Any ideas on the problem here?

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Have you added any hardware recently or opened the case for any reason?  the power supply is often the first thing to go on computers.  if it is still under warranty, you might need to send it off.
if you want to try it yourself, i'd say open your case and make sure the power cable to the motherboard is connected securely (there should be a 20 pin connector and possibly a separate 4 pin connector).  of course, make sure the power chord is connected securly to the back of the computer.  make sure the psu is on 115 instead of 220 (unless you need 220).
good luck!

Posted on Apr 20, 2009

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Green power supply light is flashing so power is getting to the computer, however the computer will not start from start button. Have removed case and tried ***** start button. Didn't work. Comput


Power getting to the computer/Power Supply?
Yeah.

Power Supply good? -> NO

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 from 51 to 125 Watts of power.
Just depends on what Processor it is.

HP Pavilion a810n Desktop PC?
Uses an AMD Athlon 64 3300+ processor,
(Operates Up To a frequency rate of 2.4GHz)

http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&docname=c00280647

http://en.wikipedia.org/wiki/List_of_amd_athlon_64_microprocessors#.22Newcastle.22_.28CG.2C_130_nm.29

Can use up to 89 Watts of power.

Your Power Supply doesn't even have enough power to spin fans, much less start the Processor.

Want to test the Power Supply? Have a multimeter?
No? Have a power supply you can borrow for a test unit?
KNOWN to be good, and Compatible?

For additional questions please post in a Comment.
Regards,
joecoolvette

Aug 05, 2012 | HP Computers & Internet

1 Answer

My 7 year old HP Pavilion desktop computer won't start up. The power supply fan is not coming on but a green led light does.


I would start by trying a replacement power supply.
Usually when motherboards show a fault, beep codes are issued as the power is applied.

Jan 26, 2011 | HP Computers & Internet

1 Answer

My "hp pavilion a220n" won't power on. ... I was


Pull the power cord out and press the power button on the PC to drain the power for 10 seconds. Then plug the power cord back in and turn the computer on. If still does not work, then the power supply may be blown out and needs replacement.

Dec 23, 2010 | HP Pavilion a220n (DK218A#ABA) PC Desktop

1 Answer

My "hp pavilion a220n" won't


Check all wires for loose connections--- if the memory was wrong or something, it would still attempt to boot but stop during the POST and start to beep

Dec 23, 2010 | HP Pavilion a220n (DK218A#ABA) PC Desktop

1 Answer

I plugged in my tower and i heard a loud high pitch beeping sound the green led light in the back was on but the power button turns green and the green led light in the back turned off there is no signal...


the green led light is it beside the network cable connector. if it is so, then it is always meant to be like that when you power up your computer. it is not something serious and it is normal.

Aug 18, 2010 | HP Pavilion 533w (P9859AR#ABA) PC Desktop

1 Answer

Does not power up. LED light near plug on on &


trouble shoot it first before we say that it is power supply, disconnect and connect it to ac sourece, press the power button, if no effect, it is power supply, but if the fans work, replace or check the vga cale to monitor, or the monitor itself

Jul 22, 2010 | HP Pavilion m7100y (PX189AV) PC Desktop

2 Answers

Blue button flashes and green light in the back stays on. When I unplug power source, the blue light still flashes for another 10 seconds. When it shuts off completely, I plug it back in--then it...


Power Supply failure. Weak Voltage power rail.

Blue light in the front is the Power On LED light. Green light in the back is on the Power Supply.

Primer:

When a Power Supply is plugged into power, there is a 5 Volt Standby power present in the Power Supply.

When you press the Power On button, this in turn presses against a Power On switch.

The Power On switch is located inside the plastic Power On button.
This is a basic example of a Power On switch,

http://www.directron.com/atxswitch.html

Pressing the Power On switch closes a circuit for the 5 Volt Standby power.
The 5 Volt Standby power is then directed to a circuit inside the Power Supply.

This action turns the Power Supply on.
Power then goes from the Power Supply to the motherboard.
The first chip to receive power is the BIOS chip.

[Chip and Chipset are slang terms for I.C.
Integrated Circuit,

http://en.wikipedia.org/wiki/Integrated_circuit

BIOS = Basic Input/Output System ]

The BIOS chip has the BIOS program burned into it.

BIOS, (The BIOS program), 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.

(Windows XP is one example of an O/S. Operating System)

Secondly,
1) ALL of the LED lights, use less than 1 Watt of power from the Power Supply.

[ The HP Pavilion a1250n desktop computer, comes with an ATX style of Power Supply, which has a reported Maximum Wattage rating of 300 Watts]

2) EACH fan uses 2 to 3 Watts

3) A typical Processor uses 51 to 125 Watts. Depends on what Processor it is.

[The HP Pavilion a1250n comes an AMD Athlon 64 X2 3800+
This particular Processor uses (Fits into), a Socket 939 processor socket.

The Athlon 64 X2 3800+ can use up to 89 Watts.

http://en.wikipedia.org/wiki/List_of_AMD_Athlon_64_microprocessors#Athlon_64_X2

Look under TDP.

This is what a Socket 939 processor socket looks like,

http://en.wikipedia.org/wiki/Socket_939 ]

You have enough power to light those simpy LED lights, and spin the fans a few times, but not enough power to Turn the Processor on, and keep it on.

No Processor running, No computer.

What causes Power Supply failure?

1) Computer is dirty inside, as well as inside the Power Supply.

In reference to the Power Supply;
The Power Supply used in your computer is an SMPS.
Switched-Mode Power Supply.

http://en.wikipedia.org/wiki/Smps

There are two cooling components,
A) The Fan
B) Heatsink's which are used internally. (Inside)

[Typical construction of a Heatsink is a plate of metal with tall, thin fins protruding from it.
The plate of metal absorbs heat, from whatever object it is placed against.
The tall, thin fins absorb the heat from the plate of metal, and radiate the heat away.

If a fan is used in conjunction with a Heatsink, the air flow from the fan goes in-between the fins, and around the fins, and help to dissipate, (Carry away), the heat ]

When the Fan's blades, center hub, and surrounding cage (Shroud) are clogged with 'Gunk', the Power Supply heats up.

Heat = Wasted Energy

The more heat, the more the Power Supply strains to keep up with the call for power.
Eventually components inside the Power Supply fail, and the Power Supply fails.

2) Low quality Power Supply.
Low quality components are used in the Power Supply

The ATX style of Power Supply is used in a Large percentage of computers out there.
Very readily available.

I would suggest you install a Power Supply with more Wattage.
A computer only uses the power it needs, and NO more.
Won't hurt your computer.

Will help your computer as there will be less strain on the Power Supply.
Also the 300 Watt rating on that Power Supply is bunk.
Padded rating to make the Power Supply look better than it is.

The actual Wattage rating, is more like 60 to 70 percent of what is stated.
(180 Watts to 210 Watts)

Need help in opening your computer case, and replacing the Power Supply, and/or a recommendation for a Power Supply, let me know in a Comment.

[BE SURE to follow Anti-Static Precautions, BEFORE you reach inside your unplugged from power, computer ]

Jun 26, 2010 | HP Pavilion a1250n (EG194AA) PC Desktop

1 Answer

HP computer doesn't turn on


Your power supply is bad--you will need to replace. I suggest looking at tigerdiect for a replacement.

Dec 12, 2008 | HP Pavilion a305w (DM181AR) PC Desktop

1 Answer

No power!!!


Dear javier4017,
> First ensure that any beep is coming or not
> check numlock LED status glowing or not.
> If numlock LED glowing it means cpu working fine
only problems with monitor
>If numlock LED not glowing its mean problems with cpu
> if problems with CPU Find check RAM may have dusting problems.

Dec 07, 2007 | HP Pavilion 523n (P9851AR#ABA) PC Desktop

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