Question about HP Compaq Presario SR1550NX (PY059AA) PC Desktop

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  • justbobs792 Jun 06, 2010

    I found the problem. The heat sink on the MCH had become unhooked from the clip due to a loop that it attached to had pulled out of the motherboard (fried the MCH0.



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When a monitor displays No Signal, it is an indication that there is no video signal going to the monitor.

The monitor is working fine.

1) Could be due to a bad monitor cable. They do go bad.

Test would be to take that monitor cable, (If it disconnects), and use it on a known to be working computer.

2) Could be the graphics of the computer.

If the computer has Integrated Graphics, the test would be to install a graphics card, and plug the monitor into it.

[Integrated Graphics is also termed as OnBoard Graphics.
On the motherBoard.

The GPU is the graphics 'engine' of a computer.
Graphics Processing Unit.

It can be soldered directly to the motherboard, (Integrated Graphics), or soldered to a removable graphics card. ]

When you install a graphics card, (graphics expansion card), the Integrated Graphics is bypassed.
The monitor plugs into the graphics card, not the motherboard.

Could be wrong, but I'll bet it's the Power Supply.

If this problem directly relates to a Compaq Presario SR1550NX, the computer is 5 years old. (According to my sources)

If the computer isn't cleaned inside, and the Power Supply isn't cleaned inside, on a regular basis as needed, the Power Supply is one hardware component that is sure to fail.

It's the top problem relating to computer failure.

The cooling components for a power supply is it's fan, and Heatsink's that are used inside.



The basic physical makeup of a Heatsink is a flat plate of metal, with tall, thin fins protruding from it.

The flat plate absorbs heat from whatever it is placed against, and the tall, thin fins absorb the heat from the plate.
The fins then radiate the heat away.

If there is a fan used along with a Heatsink, (Such as in the Power Supply, or on a Processor), the fan moves air in-between the fins, and around the fins, helping to carry the heat away.

If dirt, dust, hair, etc. is clogged on the fan blades, center hub, and surrounding cage, the cooling capacity drops tremendously.

The fan cannot move the needed amount of air.

To include on the Heatsink/s inside the Power Supply.

The gunk acts like an insulating blanket, causing the Heatsink to retain the heat, not conduct it away.

Heat = Wasted Energy

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

The Power Supply may seem like it is operating okay.

Lights light, fans spin, and it may sound as though the Harddrive inside is operating.

The Power Supply could have a weak Voltage power rail.

Power Supply's are rated in Wattage.
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 anywhere from 51 to 125 Watts.

A bad Power Supply with a weak Voltage power rail, will have enough power to light lights, and maybe spin fans, but not enough power to turn the Processor on.

Harddrive sounds like it is working, because the Platters inside are being spun by the Spindle motor.

There is no Processor operating (The 'Brain') to find the boot sector on the Harddrive.
Platters are spinning but the Arms aren't moving the Read/Write heads across the Platters.

In short the computer is not operating.

No video signal to the monitor, because there is no computer operating to send a video signal.
Bad Power Supply.

Posted on Jun 06, 2010

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  • joecoolvette
    joecoolvette Jun 06, 2010

    Fried your Intel Northbridge?

    That's a bummer!

    I've never had a Heatsink come loose from a Northbridge chip.

    To anyone viewing this problem that doesn't know what a Northbridge chip is, or the Intel MCH;

    The motherboard chipset is the Northbridge, and Southbridge chip.

    (CPU stands for Central Processing Unit. Another name used is Microprocessor, or simply Processor for short)

    Chip and Chipset are slang terms for I.C.
    Integrated Circuit.

    The Northbridge chip is connected to the Processor, via the Front Side Bus (FSB)

    (Think of the FSB as a highway, where the traffic is information going back, and forth)

    The Northbridge chip handles the higher speed functions of the computer.
    The Southbridge chip handles the slower functions.

    The Northbridge chip handles the Ram Memory, and high speed graphics. (Plus information from the Southbridge chip via the Internal Bus)

    High speed graphics being AGP technology, and PCI Express technology.
    Not any graphics card inserted into a PCI slot, nor Integrated Graphics.
    This is handled by the Southbridge chip.

    With Intel, Northbridge chipsets are also known as the MCH.
    Memory Controller Hub,

    The Northbridge chip usually is covered with a Heatsink.

    The general Heatsink style used, is a flat plate of metal that has tall fins protruding from it.
    The flat plate absorbs heat from the Northbridge chip, whereby the fins absorb heat from the plate, and radiate the heat away.

    There is a thermal paste compound, used in-between the bottom of the Heatsink, and the top of the Northbridge chip.

    Many pre-built computer manufacturers attach the Heatsink to the Northbridge chip, with a locking device such as a clip.

    Many many pre-built computer manufacturers, also use thermal glue to attach the Heatsink to the Northbridge chip, so that the chance of the Heatsink coming loose is reduced to a minimum.

    For the above problem this seems to have not been the case.

    (Makes me want to check the Heatsink on my Northbridge chip right now, and make sure it is attached tightly.

    It may also be time to change the thermal paste, as it does dry out due to the heat involved from the Northbridge chip)

  • joecoolvette
    joecoolvette Jun 06, 2010

    You are most kind justbobs72!

    I appreciate your rating, and your kind words.

  • joecoolvette
    joecoolvette Jun 06, 2010


    (Apparently I need to clean my glasses!)


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  • Master
  • 868 Answers

What color is the power light on your monitor? if its amber or orange solid or blinking its not getting any signal from the video card, to test whether it is you video card or the LCD monitor unplug the monitor cable from behind the computer if the LCD show a Monitor self test which is the colored bars that you will on the screenafter you unplug the monitor cable from the computer then you monitor is working fine, but if there is no power on you LCD try re-seating- Unplug replug all you power cables from the monitor, third troubleshooting is you try using a different monitor on the tower if it works then you monitor is bad and if does not then another way is if you have speakers connected to the computer and you hear windows loading up then possibly you monitor is bad, because if the video card is malfunctioning then upon powering the system you must hear at least a beeping noise for may be a second then stop, and since this is HP if the power light turns orange as well then it means the system is not booting into windows as well then it will be your computer that needs check specifically the video card, if you are using an expansion video card try using the built in video card on your motherboard make sure you remove the expansion video card before turning on the computer using the built in video card for the system to boot into the built in video ^_^

Posted on Jun 06, 2010


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