Question about HP Media Center m7250n (ED842AA) PC Desktop

1 Answer

No power when turned on - light green on back - no lights on motherboard - no fans

The computer had been turned off went to turn on no power- green light on back stays on- unplugged/plugged in after pushing and holding in on button - and after waiting 30 minutes - reseated the power switch from mb - still nothing - and tried different receptacle plug that is know to work - it was plug into power strip.

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  • HP Master
  • 3,400 Answers

Sunny,try with a other powersupply if possible.
faulty PSU are often the cause.

Posted on Jul 13, 2013

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Posted on Jan 02, 2017

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joecoolvette
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SOURCE: Blue button flashes and green light in the back

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 ]

Posted on Jul 06, 2010

jgwhomeequip
  • 1902 Answers

SOURCE: My hp a500n will not turn on

Check your BIOS battery make sure it is working correctly and that it is not out. You can use a battery tester to see.

Posted on Feb 14, 2009

  • 11 Answers

SOURCE: wont start power supply binks

What do u mean u unplug the motherboard...?

Posted on May 27, 2009

lglalight
  • 1 Answer

SOURCE: computer wont turn on

i had the same problem its going to be your power supply it probably burned out. when i changed mine it worked perfectly.

Posted on Jun 01, 2009

  • 169 Answers

SOURCE: Power Issue on my HP m7470n

try this link.....it has the steps you need to follow
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01732674&cc=us&lc=en&dlc=en

Posted on Jun 24, 2009

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Step 1: Ensure that both the power supply and the motherboard lights are flashing green, not solid or off.
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Step 3: Wait until the green light on the motherboard stops flashing and check to ensure that the green light on the power supply is now solid. If it is not solid, disconnect the power to the power supply and wait until the light turns off completely. Then reconnect, it should be solid now.

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