Question about HP Compaq Presario SR1420nx (SR1420NXPS69AA) PC Desktop

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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 months later did it again and i never had it connected to internet after it was fixed

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  • HP Master
  • 5,660 Answers

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',

http://support.microsoft.com/kb/555302

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

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00363478&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=457247#N394

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,

http://www.hardwaresecrets.com/article/616

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.

Suggest;
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,

http://www.ebay.com/itm/ASUS-P4GV-LA-Micro-ATX-Motherboard-Intel-SL7TS-2-93GHz-CPU/130808856405?rd=1&ssPageName=mem_guide:3&ih=003&category=131511&cmd=ViewItem

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.

Regards,
joecoolvette

Posted on Nov 29, 2012

  • joecoolvette
    joecoolvette Nov 29, 2012

    To Add: HP Support > Compaq Presario SR1420nx Desktop PC > Main Support page,http://h10025.www1.hp.com/ewfrf/wc/produ... Click on -> How to, in the list. Click on Adding/Replacing hardware. Click on Opening the PC Case.

  • joecoolvette
    joecoolvette Nov 29, 2012

    Starts at 0:04,http://www.youtube.com/watch?v=KN6_-8fYH...

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Posted on Sep 17, 2009

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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.
(Windows)

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.

Regards,
joecoolvette

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

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

1 Answer

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Just replace the fan. They are a standard commodity and not hard to change. Get a good one this time. You get what you pay for.

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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.

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Could be one of two things: either the power supply is going bad or the RAM is either going bad or isn't seated properly inside.

First thing I would try would be to re-seat all the memory chips inside the computer. There could be up to 4 sticks of memory in some computers. If this doesn't work, try pulling the memory out of the computer one stick and a time and booting the PC. If it boots, you've found your bad memory stick. Put all the others back in and replace the faulty one.

If none of this works, you might consider calling HP (maker for compaq) for support on getting the power supply replaced.

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what has happened is your hard drive as failed and that is why it shut down and then gave the unmountable boot volume. You could try repairing windows using your XP cd but it's a new hard drive i recon.

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