Question about HP Pavilion a1630n PC Desktop

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My hp pavillion n1623n wont turn on it gets power but wont turn on ?

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Cwhitfield75, it may appear that the computer is getting power, but in reality it isn't getting enough power, is my diagnosis so far.

Bad Power Supply. Weak Voltage power rail.

Computer Power Supply's put out three Voltages.
A) 3.3 Volts {Orange insulated wires)
B) 5 Volts {Red wires}
C) 12 Volts {Yellow wires}

Each Voltage produced has it's own power rail.
{The Power Supply produces one main Voltage. 12 Volts.
The other Voltages are derived from it}

Power Supply's are rated generally in Wattage. How much is the maximum Wattage they can produce.
(And at what percentage. Generally now, they try to produce at least at an 80 percent factor. 80 percent of the maximum voltage, and at a continuous delivery}

1) ALL the lights use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

I am not aware of a an HP Pavilion n1623n desktop computer. I do know of an HP Pavilion Media Center a1623w desktop computer.

This computer uses an Intel Pentium D 915 processor. (Dual Core)
An Intel Pentium D 915 can use up to 95 watts.
(915 is the Model Number)

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_D_microprocessors#.22Presler.22_.28dual_core.2C_65_nm.29


To summarize, you may see lights light, fans spin, and even hear the harddrive operating, but not have enough power to turn the Processor on.

With no Processor operating, the boot sector of the harddrive will not be found, and implemented. Therefore the harddrive just sits there, and spins.

http://computer.howstuffworks.com/hard-disk.htm

What causes this?

Generally, over 85 percent of computers out there are dirty inside. Inside the computer, as well as the Power Supply.

Computer unplugged from power, computer case open, and anti-static precautions observed, a can of compressed air for computers used on a regular basis as needed, could help prevent this.

The cooling hardware components, for a personal computer Power supply, are it's Heatsink's inside, as well as the fan.

http://en.wikipedia.org/wiki/Switched-mode_power_supply

{A Heatsink is composed of a flat plate of metal, which has tall, thin, fins protruding from it.
The flat plate of the heatsink is mounted, to the object it needs to carry heat away from.

Heat is absorbed by the plate, whereby it is then absorbed by the tall thin fins. The fins radiate the heat away. The fan moves air in-between the fins, and helps carry heat away}

When the cooling components are clogged with gunk {Dirt, dust, hair, etc}, the cooling capacity drops tremendously.
Doesn't take much.

Heat = Wasted Energy

The Power Supply tries to keep up with the call for power, and eventually cannot, whereby hardware components inside the Power Supply fail.

One of the main components that usually fail, are the Electrolytic Capacitors. They are the weakest link.
Looking back at the SMPS (Switched Mode Power Supply) link I gave, you can observe the photo to the top right of the page.

There you will see that Electrolytic Capacitors are used as Filters.
They filter the incoming AC electricity (Input Stage), and the outgoing DC electricity (Output Stage) produced by the Power Supply.

You can test the Power Supply voltages, or simply replace the Power Supply with a KNOWN to be good, compatible unit for a test.

[Compatible, being;
1) The test Power Supply unit has at least the same Wattage, or more.
{300 Watts}

2) The Power Supply should be the same shape, and size, so it will fit in the computer case.
{The Form Factor of the Power Supply used in a Pavilion Media Center a1623w, is an ATX}

3) Has the correct Amount of power cables, AND the correct Kind of power cables]

You can use a Power Supply outside of the computer case for a test, but I don't recommend it.

To test the Power Supply you are testing the Voltages.
The 12 Volt is the main Voltage to be concerned with.
11 to 13 Volts is Good.
Less than 11 Volts requires obtaining a new Power Supply.

You can test with an inexpensive multimeter, or an inexpensive power supply tester.

{An inexpensive multimeter can be purchased for around $10 to $12. Auto parts stores are but one place that carries them.
An inexpensive power supply tester can be purchased for around $20.

Conclusion to follow in an added Comment.

Posted on May 29, 2010

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Your Hard Drive could be bad.

Posted on May 29, 2010

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