Question about HP Pavilion a1114n Athlon 3400+/1GB/160GB/DV+/-R/RW/XPH (PX748AA) PC Desktop

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I have a problem with a HP Pavillion a1114n. when u press the power button the cpu fan spins up for about 1 second and then cuts off and then the power led blinks on and off continuously

Lots of dust and dirt inside case. Tried cleaning, but it did not help.

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  • HP Master
  • 5,660 Answers

Bad Power Supply.
Weak voltage power rail

The hardware components inside your computer (HP Pavilion a1114n Desktop PC), are cooled by air flow. Heat is radiated away, then air flow helps carry the heat away. (Heatsink/Fan)

The Power Supply is cooled by the same method.
Power Supply's used in today's computers are SMPS.
Switched-Mode Power Supply,

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

Click on the photo of the open Power Supply, to the upper right.
In-between the letters B and C, and C and D; are Heatsinks.

Look like whitish/grayish rectangular blocks, of varying thicknesses, stacked along a singular flat bar.

The block shapes are aluminum fins.

Whatever this Heatsink is placed against, it will absorb the heat from it, and radiate it away with the thin fins.
Air flow from the small internal Fan, helps carry heat away from the thin fins.

Heat = Wasted Energy
The Power Supply overheats, and cannot keep up with the call for power.
Components inside fail; the Power Supply fails.

A THIN coat of dust on the Heatsink fins for the Processor, will drop the cooling capacity a LOT.

If you would like to test the Power Supply, you will be using the test for the three main voltages;
3.3 Volts, 5 Volts, and 12 Volts. All are DC Voltage.

(In comparison two D cell flashlight batteries store 3 Volts DC.
The dangerous voltage is contained within the metal case, of the Power Supply)

You need a multimeter. An economical model is around $5 to $12.
Available in a multitude of stores. An auto parts store is but one example. Large store chains may carry them on a checkout aisle rack.

Or if there is a working unused computer, that has a KNOWN to be good, and Compatible Power Supply, you could borrow it for a temporary test unit.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&tmp_task=solveCategory&cc=us&dlc=en&lang=en&lc=en&product=501964#bph06788_section_2

Regards,
joecoolvette

Posted on Nov 05, 2012

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I have the same problem but it seems to be related to the NIC. When I start without the ethernet cable plugged in it's fine, plug in the ethernet cable and the machine stops dead. I can't even start the PC with the cable plugged in.

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SOURCE: Trying to power up the unit

It sounds like either a bad Hard Drive or your Motherboard is shot. Is there anything showing up on the screen when the computer is trying to boot up?

Posted on Jul 22, 2010

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SOURCE: cannot get power to the tower. power led is

First check to see if you have any capicitors that are defective. (see attached image)mrtekhead.jpg
If you see any that look like this then the motherboard will need to be replaced.
If you do NOT see any, then unplug the power cord from the wall and let sit for 15 minutes to let the unit discharge. Check power outlets or power strips to make sure they have power too. Plug back in and check for power. Hope this helps.

Posted on Mar 06, 2011

kritiko
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SOURCE: Error on normal boot up,

HI ker7758 ,

You may need to apply "Thermal paste/grease " to the CPU.

You can watch this video tutorial from Youtube:
http://www.youtube.com/watch?v=o7rPqCvCt0g

There are different types of thermal grease. You don't have to buy the expensive ones. The cheapest on the market should be able to do the job.

Posted on Apr 09, 2011

Testimonial: "I found one of the hooks for my heat sink springs had broken off. I re-soldered. Will also take your advice & re-paste."

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That is generic hardware fault, any faulty device can cause the problem.

The motherboard must be started with a minimal set of devices to troubleshoot.

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New case fan running but still getting error message system fan failed.


Did you try;

Power off, power unplugged to computer.
Press the Power On button, and hold it in. Hold for a count of 10 seconds.
Let go.

Do this procedure two more times.

Plug the computer back into power. WAIT 1 minute, turn the computer on.

This method clears CMOS Error Codes, and sets BIOS Setup back to the factory default settings.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00864946&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3340228#N436

CPU fan spinning at required minimum RPM's?

Not talking about the SYS_FAN (Case fan)



Regards,
joecoolvette

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Hello, that sounds a motherboard problem...
Try to do this first :
1- take the battery out and disconnect from power
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I WAS HAVING PROBLEMS WITH OVER HEATING, NOW MY LAPTOP HAS CUT OUT AND WONT RE-START. WHEN YOU PRESS THE POWER BUTTON IT LIGHTS UP AND YOU CAN HEAR THE FAN OR SOMETHING BUT THE SCREEN STAYS BLANK. ALSO...


When a laptop overheats the CPU will shutdown, this is known as thermal overload. The laptop will not boot up until the CPU has cooled down. If this problem in not fixed then the CPU will eventually fail.
This problem is usually caused by a faulty fan or the fan and heat sink is clogged with dust.
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