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Turns off when windows starts to boot. can not reinstall windows. motherboard:asus p4gv-la computer: compaq presario SR1420NX processor: Intel Celeron

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Sounds like a faulty power supply. Very cheap and easy fix.

Posted on Mar 12, 2011


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Compaq 1420 nx turns on then turns off immediately

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,

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

Scroll down to the motherboard Photo.

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

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.


Dec 04, 2012 | HP Compaq Presario SR1420nx...

1 Answer

Compaq presario sr1420nx turns on makes one beep then resets in continual pattern doesnt get to boot up

To go with my other solution to you;

You press the Power On Button. This in turn presses the Power On switch, located inside the plastic assembly; of the Power On Button.

When the Power Supply is connected to power (Plugged in), there is always a constant 5 Volts present. (DC Voltage)
This is the 5 Volt Standby power.

Pressing the Momentary Contact Switch, the Power On switch; closes a circuit, momentarily.
The Soft Power On circuit.

This 'excites' the Power Supply, and turns it on.
(Sounds like the start of a steamy novel)
The first chipset to receive power is the BIOS chipset.

The Basic Input/Output System is activated. (BIOS program)
BIOS looks to see what devices are connected, DOES a Ram Memory count, and turns the Processor on.
Then BIOS hands the computer over to the Operating System.

ONE beep indicates BIOS has done a Ram Memory test, and everything is OK.
Now next we have BIOS turning the Processor on.

Then handing the computer over to the O/S.

Due to what is going on, as stated in my other solution to you; the Processor is turned on, BIOS goes for the boot files on the harddrive; then power problems develop from the bad capacitors; and BIOS turns the Processor off.

Just about had time to access boot files; but now the Processor is turned off, ('Brain'), and boot files on harddrive couldn't be accessed.
Now here we go again; with the weakened capacitors trying to do their job.
Cycle starts all over again, but weakened capacitors 'drop to their knees', and Processor turns off.

Over, and over; until capacitors fail all the way, and Nothing happens.


[ !O_O! Martha I think the boy's done lost his mind! lol! ]

Nov 29, 2012 | HP Compaq Presario SR1420nx...

1 Answer

Compaq presario sr1420nx wont boot up keeps turning on and off resetting rapidly how to open computer..when it did turn on was getting unmountable boot volume error had it fixed at geek squad once and 3...

Turning on, and off sounds like bad capacitors on the motherboard.

I don't believe the members of the organization you took it to; have the savvy to repair.
(Frankly I don't think they could pour P out of a boot..................Wait!...............Did I say that out loud?)

This is what it states from Microsoft for 'Unmountable boot volume',

The jist is the Harddrive cannot be reached - Bad IDE ribbon cable
The Windows files are corrupted - Use Restoration Disk
BIOS Settings are set wrong.

I'm going to state something different. May be putting my neck out...

Capacitors on the motherboard.
To be specific the ones used on your motherboard are Electrolytic Capacitors.
More specifically; Radial Aluminum Electrolytic Capacitors

An Electrolytic Capacitor has Electrolytic paste inside.
When the capacitor starts to fail, it's because the paste has developed a gas inside. Hydrogen Gas. The gas expands, and pops the seals of the capacitor open.

So much paste loss, and the capacitor operates at a weakened state.
Too much paste loss, and the capacitor fails.

Capacitors are used as Voltage Regulators, and Filters.
The ones used as Voltage Regulators, are in the Motherboard Voltage Regulator Circuit,

Part of what the motherboard voltage regulator circuit does; is to regulate voltage for the Processor.
The Processor MUST have a steady, 'clean', supply of voltage; and it MUST be kept within the small tolerance range, for the Processor.

Cannot be too much, or too little; or BIOS will turn the Processor off.

The Processor is the 'Brain' of the computer.
Guess what happens if it turns off, turns on, turns off, etc?

I think what you are seeing.
Cannot access boot files on the harddrive.
No processor.

Computer off, and unplugged from power.
FOLLOW Anti-Static Precautions.

Anti-Static Precautions
Your body carries Static electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.
Relieve your body of Static BEFORE reaching inside your computer.

Computer ON a table, computer unplugged from power, computer case open;
TOUCH an unpainted surface, of the metal frame of the open computer case.
This action will relieve your body of Static.

IF you leave your computer in the middle of working on it, be SURE to Touch the metal frame again, upon your return.

There are going to be cables (Wires), in the way. You can gently move them aside to look at the capacitors. L@@K close. May need a bright light, and magnification.

Capacitors look good, I'm full of beans?
OK. Onward through the fog.

Replace the IDE ribbon cable going TO the harddrive.

Test the Power Supply, or see if you can borrow a KNOWN to be good, Compatible power supply; from a working computer for a test.

I think capacitors, therefore motherboard replacement.

Not advertising for seller, nor website. Just from a quick search,

MAKE notes, and drawing/s as to where EACH cable plugs into.
The ones I may not be able to help you with, are USB, Front Panel audio, Front Panel Firewire (1394a)
Power cables, data cables to optical drive/harddrive, plus Front Panel header; yes.

For additional questions please post in a Comment.


Nov 28, 2012 | HP Compaq Presario SR1420nx...

1 Answer

How to open compaq presario sr1420nx computer

You have a virus in your computer. Boot the computer, immediately hit the delete key until you can get to the setup screen and it will allow you to format your drive.

Nov 28, 2012 | HP Compaq Presario SR1420nx...

1 Answer

Need drivers for video controller

Your motherboard is a asus ASUS P4GV-LA, with a Intel 845GV Graphics
You can download video driver on this page:

If this helps orsolves the issue, please rate it and give a testimonial for myresponse.

Feb 27, 2011 | HP Compaq Presario SR1410NX PC Desktop

1 Answer

System shuts down after a few seconds

Tr taking it to your local computer shop and get them to check it, or see if it is stuck in presentation mode.

Or try taking out things on the motherboard that arn't necesary like sound, graphics and other cards.

Aug 20, 2009 | Compaq Presario SR5710Y PC Desktop

1 Answer

Need the pin assignments for the mother board

On most motherboards the front panel connections are printed in the connectors on the motherboard. When you connect the various LED indicators and when you power up and they do not light up then just switch the connectors around, because they are are polarized.
You can go to the motherboard WEB site (ASUS) to download a manual, the manufacturer and model number is printed on the motherboard.

Jun 28, 2009 | HP Compaq Presario SR1420nx...

1 Answer

I need the name of the motherboard used in the Compaq Presario SR1410NX so I can look at the manual.

HP lists the Motherboard as an Asus P4GV-LA.

Here is the support page for your computer:

SR1410NX Support

Click on Product Information to get the specs for it, including motherboard info.

Unfortunately Asus does not list this version on their support site but HP has quite a bit of info on the link listed below.

P4GV-LA Specs

Thanks for using Fixya.

May 20, 2009 | Compaq Computers & Internet

1 Answer

ASUS P4GV-LA motherboard swapout

It's true that P4 boards are not manufactured any more. But again, are you sure that it’s the motherboard which has problem, the SMPS (power supply might have some problem.) might be faulty too. Check the SMPS first.

Mar 14, 2009 | Acer Veriton 7100 PC Desktop

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