Question about HP Computers & Internet
Hello, I have a 404794 MOBO of an HP DC5700 computer, the issue is that the computer does not turn on, no booting, no LEDs, no Fans after pushing the power button. Only the 5V AUX CR1 LED is blinking all the time. Power supply is working fine when you test it alone. Does anyone have an idea what can be wrong. I am afraid some kind of electrostatic discharge could cause some damage, because it was working and ON but when my baby touch the back of the chassis the computer shutdown. Thanks in advance
1. This is a quite old motherboard. After years of usage the capacitors next to the processor might pop out and no longer work, therefore the processor does not get the required power. Check these capacitors. I added a photo of faulty capacitors. Check them. The top surface of them has to be flat without any electrolite(brown stuff) leaked out. This is a hard to fix issue because you need to solder them out and replace them with capacitors of the same type.
2. Make sure the button is working. It could have gone wrong too. You can test it by disconnecting the connector of the button (it is connected to two small pins) and connect the pins manually with some metal object or the end of a screwdriver for a moment. If the pc turns off the button is faulty.
3. If these suggestions wont help some people reported that putting the whole motherboard in the oven for a specific time on a given temperature can fix things.
Posted on Mar 15, 2019
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Posted on Jan 02, 2017
Usually, if it's a motherboard that has a failed component on it, you will see failed Electrolytic Capacitors. The small aluminum 'Cans' on the motherboard.
The Electrolytic Capacitors that surround the Processor, should have special attention payed to them. These capacitors are Voltage Regulators for the Processor. If even One is bad, the Processor won't receive the correct amount of voltage, and won't turn on.
Most of the time Electrolytic Capacitors will show visual signs of failure.
There are rare occasions that they do not.
In this case the Electrolytic Paste has dried up in the capacitor, and no outside visual signs will be shown.
I realize that it may look like I'm typing a foreign language here.
This is more information about Visual Signs of Capacitor Failure,
The Gateway GT5662 Desktop PC uses an ECS MCP61PM-GM motherboard.
As you can see in the photo below, it does use Electrolytic Capacitors, and not solid capacitors,
ECS motherboards are not reliable, and known for capacitor issues.
I believe your problem directly stems from a bad power supply.
Power supply has a Weak Voltage Power Rail.
Reasoning for this diagnoses?
Computer tech who has seen this problem at my shop over the years, occur more times than you can shake a stick at.
Would rate it at 70 percent of the reason for computer failure.
It is also rated at that percentage all over the internet.
The diagnoses you stated is correct for this type of problem.
Weak voltage power rail:
Your Gateway GT5662 can come with one of three power supply's.
1) Bestec - Part Number - 6506056R300 - 300 Watt
2) HiPro - P/N - 6506055R300 - 300 Watt
3) Delta - P/N - 6506054R300 - 300 Watt
(P/N's are Gateway numbers)
These are cheap generic power supply's. They have cheap components inside.
Cheap Electrolytic Capacitors,
Gauge of wiring is too small,
Rectifier Bridge is of low quality,
and the list goes on.
When you pick your power supply up, you can feel how light it is in weight.
You can literally feel the difference in weight, when you pick up a decent power supply in comparison.
These power supply's have three main voltage rails. (Very common)
1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail
The Electrolytic Capacitors used inside the PSU, (Power Supply Unit), are used in the Input stage, and the Output stage.
Used for the incoming 120 volts AC from your house, in the Input stage.
Used for the outgoing DC Volts that have been converted, inside the power supply in the Output stage.
[A computer power supply converts AC electricity, into DC electricity for the computer.
3.3 Volts, 5 Volts, and 12 Volts are DC.
Alternating Current and Direct Current. A flashlight battery is an example of stored DC]
With a weak voltage rail there isn't enough power to turn on the processor.
1) ALL the lights use less than 1 Watt
2) EACH fan uses 2 to 3 Watts
3) A typical Processor uses 55 to 125 WATTS.
This is why the Power On light comes on, the fans spin a few times, but no Operating System comes up.
(Windows XP is an example of an operating system)
No video signal from the computer, you get a No Signal on your monitor. No video signal because the computer isn't working.
When you press the Power On button, you are making a temporary circuit to the power supply, through the motherboard.
You are making a circuit that delivers 5 volts to the power supply. Just for a few seconds. Soft Power On.
(That's why the Power On switch is spring loaded)
The power supply comes on, and the BIOS program is activated.
(From the BIOS chip on the motherboard)
BIOS checks to see what devices are installed, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.
You don't even have enough power to activate BIOS now.
Why does a power supply fail?
Usually two reasons, or a combination of both.
1) Computer is dirty inside, and so is the power supply.
Computers should be cleaned inside, ( And the power supply), on a regular basis with a can of compressed air for computers.
(Computer unplugged from power)
2) Cheap components used in a cheap quality power supply.
Replace the power supply, also insure that the computer is clean inside before doing so.
Do you have another power supply that is compatible, and is known to be good to use for a test?
(300 Watt ATX style with at least the same power cables)
Some of us have old computers around, that we can 'Borrow' one for a test, then put it back.
This would prove my diagnoses to be correct, and you will know what to buy.
This is NOT an invite to open your power supply.
The Electrolytic Capacitors used inside can hold a charge for Weeks, sometimes Months!
If your fingers touch the wrong spot, (Terminals on capacitor, or circuit one, or more are in), YOU could receive the charge!
Shock is Bad to Fatal!
Posted on Jan 08, 2010
get yourself a themaltake ps
make sure you remove the old one and take it with you to the shop or get the shop to do it for you if you dont have the expertise yourself.
hope this helps
Posted on Jan 01, 2009
SOURCE: power LED on but no boot up
it could be your power switch, veriy that it isnt the power supply by
1.) un-plug it from the main board
2.) look at the main board connector(one coming of the power supply)
3.) you should see green wire and next to it a black one
4.) using a paper clip bridge the too wires
5.) if it works proceed to net step if not get a new power supply
to check case switch and board switch
1.) plug in power supply to main board
2.) look at the pins where the power button connects to
3.) using a metal object (blade screw driver) bridge the pins
if the board should start up>
then its your power button on the case that is bad, you can try to repair it, chage it or buy a new case,
if it doesnt work.
1.) ensure that jcms(jumper to flash the bios) is set correctly
2.) unjack each drive one at a time to see if any is causing stalling
3.) get a new main board
Posted on Jan 02, 2008
I have the same problem. I found this:
Posted on May 18, 2010
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