Question about HP Compaq Presario SR1420nx (SR1420NXPS69AA) PC Desktop

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Compaq 1420 nx turns on then turns off immediately

I tried to boot up my compaq desk top computer which I haven't used in over a year. It worked fine previously. When I power it on it runs for about 2 seconds, then shuts off. All 3 fans are operating.

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  • HP Master
  • 5,660 Answers

A brief primer if I may;

Electrolytic Capacitors are used on the motherboard, and in the Power Supply, in the Compaq Presario 1420nx Desktop PC;

HP Support > Compaq Presario SR1420nx Desktop PC > Main Support page,

http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&dlc=en&lc=en&product=457247&

Product information > Product specifications > Motherboard Specifications, P4GV-LA (Guppy),

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00363478&tmp_task=prodinfoCategory&cc=us&dlc=en&lc=en&product=457247

Scroll down to the motherboard Photo.

http://capacitorlab.com/visible-failures/index.htm

General example of a Switched-Mode Power Supply, (SMPS), case open,

http://en.wikipedia.org/wiki/File:ATX_power_supply_interior-1000px_transparent.png

Personal computers have used this style of Power Supply, for quite some time.
The one in your computer is just an ATX style, and is the type used in MANY personal computers. (Not Small Form Factor, however)

THIS IS NOT an invite to open your Power Supply, and attempt repair.
The capacitors used are Radial Aluminum Electrolytic Capacitors.
The blue ones marked by the letter B, are high voltage. MAY have Up To 100 Volts stored.

Your fingers touch the terminals on the bottom, of one of these babies; the shock can be BAD to FATAL!

Your fingers touch a circuit, that one or more capacitors are in, and the shock can be BAD to FATAL.

There is a Proper method to discharge them, BEFORE working on the unit. Am not going to post.
(Does NOT involve a metal screwdriver, or other metallic object! Good way to have hot molten metal spray in your face!)

The method of repair is to REPLACE.

Inside an Electrolytic Capacitor is Electrolytic Paste.
This paste breaks down over time. Chemical composition breaks down.

Computer engineers know this, and use capacitors that are rated at twice, or 200 percent; of what is needed.
This way when the capacitor breaks down to 50 percent good, it is still 100 percent good for the application it is used in.

Unplug an electronic unit from power, and the chemical composition of the paste breaks down more rapidly. All electronic units need a trickle charge when being stored. (Pawn shops know this)

To summarize;
FOLLOW Anti-Static Precautions after unplugging your computer from power, BEFORE reaching inside your computer. (Don't know, and would like to? Post in a Comment)

Check the 'caps' on the motherboard.
Note* Sometimes the Electrolytic Paste dries up, and shows NO outward visual signs of failure.

'Caps' on motherboard found to be good, suspect the Power Supply.
I can guide you in testing it, or you may have a KNOWN to be good, Compatible power supply, from a working computer that you can borrow for a test unit.

Regards,
joecoolvette

Posted on Dec 04, 2012

  • joecoolvette
    joecoolvette Dec 04, 2012

    To Add: I suspect the Power Supply. Why? Because I believe it has a weak voltage power rail. 1) If ALL of the LED's (Lights) were on at once, they would use less than 1 Watt of power. 2) EACH fan uses 2 to 3 Watts of power. 3) A typical Processor can use from 51 to 125 Watts of power. Therefore a Power Supply with a weak voltage rail will have plenty of power, to light simpy little LED's, and spin fans, but Not enough power to turn the Processor on. Intel Celeron, Model 340? (2.93GHz) Uses Up To 73 Watts,http://en.wikipedia.org/wiki/List_of_int... (Scroll down) Bet the computer is dirty inside also. Regards, joecoolvette

  • Charles Panchak Dec 04, 2012

    Thanks for the help. I removed and reinserted the ram and the modem board (I think it was modem board. Now machine stays running, but makes a steady beep sound which lasts about 5 seconds, stops and beeps again. Nothing showing on monitor

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Unless the power button sticks or does not pop back out, i doubt the issue is in the switch, but it can be tested by replacing it with a momentary switch from Radio Shack (not an exact fit, but good for testing)
This sounds like a power supply issue. That would be the first thing to check. If it is NOT connected to anything except the power cord , it shouldn't run unless switched on.
Could also be the motherboard, but before you start dismantling the computer , check the obvious. Open the case (usually to screws on the back) inspect all the cables, reseat your ram chips and addin cards.
Not to scare you ar anything, some of these presarios have bad capacitors on the mother board. coupled with the fact that they are difficult to clean (inside) and airflow is not maximized in the case, they tend to cause the capacitors to swell and leak, losing voltage.
When you are inspecting the insides of your case, take note of any capacitors (little cans with crosses on the top) on the main board inside around the CPU fan that are swollen or leaking.
If you find these in bad condition , i would replace the motherboard.

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