Question about HP Pavilion a400n (DQ173A#ABA) PC Desktop

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"No Signal" on monitor after boot

I had to replace the power supply after a power surge. Now computer will power up, but right after the "Windows XP" screen displays, the monitor goes black and shows "no signal". The computer is still booting, because I can hear the Windows tune. Tried another monitor with the same results. Is my graphics card bad?

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  • goose93 Aug 24, 2008

    Thanks! I tried moving the graphics card to another slot, and it worked for a few minutes but the resolution was wrong. When I was changing the resolution settings, the monitor went blank and said " no signal" again.



    I'll try a new card next. Thank you!

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Hi try to use different slot on your motherboard see if that helps if not try different video card...if that didn't help it might be your motherboard that went bad

Posted on Aug 24, 2008

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1 Answer

Power light off


Power surges are damaging spikes of voltage in an electrical systems, caused by lightning strikes, changes or problems with the electrical grid, or large appliances.

Power surges damage or destroy computer hardware by overheating circuit boards and other components.

Surge protectors and other devices are used to protect computers and other electrical devices from power surges.

If damage occurs to a computer from a power surge, a process of trial and error is used to replace the damaged components.


Replace the surge protector or power strip.
If neither was attached to the computer, it is highly recommended that one be used.

Follow the user's manual to open the computer.
The computer manual may have shipped with the computer in book or CD form or may be found online.

Examine the system and make note of any visibly damaged components.
Damaged components may show visible burn damage or no damage at all.


Follow the user manual to remove the power supply.
You will need to unplug the power connections to each device in the computer as well as the system board.

WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL.
http://www.kitchentablecomputers.com/static.php - rules
Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.

Some of the below steps recommend removing physical parts within the computer.
While in the computer it is highly recommend that you be aware of ESD and its potential hazards.


Removal is generally achieved by removing the holding screws and lifting the power supply out of the system.

Follow the user manual to install the new power supply.
Plug the power cables into the computer components and the system board.

Close the case.
Do not re-insert the screws.

Plug the power cable into the computer and attempt to power the computer on.

Replace the power cables to the monitor and computer.
Examine the monitor.

If the monitor does not power on, it will need to be replaced.
Determine if both the monitor and computer power on.

If the monitor powers on but the computer does not replace the system board.
If both power on but there is no video signal, replace the video card.

Boot the system into Windows.
Go to the "Control Panel" and double-click on the "System" icon.

Click on the "Hardware" tab.
Double-click the network card, sound card, and other peripherals that are listed in the hardware tab.

If you replaced the system board, ensure that the device drivers are in place for the peripherals. Replace any peripheral that is still non-functional.

Computer Repair Tutorial Help and Tips

http://www.thepcmanwebsite.com/computer_repair.shtml

Dec 08, 2013 | Dell Vostro 410 Desktop Computer

1 Answer

I can not turn it on. How can I fix a no power problem?


Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty
http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm
Testing and replacing the PC power supply
http://www.youtube.com/watch?v=hbNxhvm0czs
One bad lead can cause a computer to continue on a cycle of restarting or to shutdown or fail to detect ,boot up a computer hard drive
WARNING Before you start troubleshooting remember that you are dealing with electricity that can KILL.
http://www.kitchentablecomputers.com/static.php - rules
Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.
Some of the below steps recommend removing physical parts within the computer.
While in the computer it is highly recommend that you be aware of ESD and its potential hazards

Power surges are damaging spikes of voltage in an electrical systems, caused by lightning strikes, changes or problems with the electrical grid, or large appliances.
Power surges damage or destroy computer hardware by overheating circuit boards and other components.
Surge protectors and other devices are used to protect computers and other electrical devices from power surges.
If damage occurs to a computer from a power surge, a process of trial and error is used to replace the damaged components.
Replace the surge protector or power strip.
If neither was attached to the computer, it is highly recommended that one be used.

Follow the user's manual to open the computer.
The computer manual may have shipped with the computer in book or CD form or may be found online.
Examine the system and make note of any visibly damaged components.
Damaged components may show visible burn damage or no damage at all.


Follow the user manual to remove the power supply.
You will need to unplug the power connections to each device in the computer as well as the system board.
Removal is generally achieved by removing the holding screws and lifting the power supply out of the system.


Follow the user manual to install the new power supply.
Plug the power cables into the computer components and the system board.


Close the case.
Do not re-insert the screws.
Plug the power cable into the computer and attempt to power the computer on.


Replace the power cables to the monitor and computer.
Examine the monitor.
If the monitor does not power on, it will need to be replaced.

Determine if both the monitor and computer power on.
If the monitor powers on but the computer does not replace the system board.
If both power on but there is no video signal, replace the video card.
Boot the system into Windows.
Go to the "Control Panel" and double-click on the "System" icon.

Click on the "Hardware" tab. Double-click the network card, sound card, and other peripherals that are listed in the hardware tab.
If you replaced the system board, ensure that the device drivers are in place for the peripherals. Replace any peripheral that is still non-functional.


Computer Repair Tutorial Help and Tips
http://www.thepcmanwebsite.com/computer_repair.shtml

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2 Answers

Why will HP a6700f onboard VGA connector will not provide a signal ?


have you tried when in the vga card to go to control panel/display and look at change display settings and connect to a projector?

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Power to house went out during area power outage. Everything came back on except the computer? Tries to restart by holding power switch in, unplugged and replugged power cord - no response on monitor. ...


When the power is returned after a power outage it can cause a power surge and damage electronic equipment such as a computer. This is a reason to install a surge protection power board and connect your computer equipment to a surge protection board.
The switch mode power supply may be faulty and replacing it may get your computer operating again.
If you cannot DIY then ask a friend or take it to a computer repair shop.

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1 Answer

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When I boot up my computer, up to the point where it displays Windows XP, the monitor blanks out. The power button on the monitor goes from green to orange as if it's not receiving any signal from the...


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If my answer is helpful please rate.....

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HP Pavilion a1150y fans run when powered on but windows doesn't load, monitor, mouse and keyboard do not work. (Running Windows XP)


Believe it or not, it's due to a weak power supply. More specifically, weak voltage rail/s caused by failing Electrolytic Capacitors.

A bad computer power supply is about 70% of computer failure.

ALL the light use less than 1 Watt. EACH fan uses 2 to 3 Watts.

A processor uses 55 to 125 Watts. Depends on the make and model.

Since the power supply is weak, it doesn't have enough power to turn the processor on.
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No computer running, there is no signal to the monitor.
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