Question about HP Pavilion a420n PC Desktop

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No video on monitor

When I boot, there is no video on monitor. I changed video cable, but suspect it might be my video card. May I order a new video card? If so, what part number would be the best?

Thank you,

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My samsung dnie jr. flat colour tv got damged during thundering its power supply unit is ok but picture is not coming so how to check its electronic tuner

Posted on Jun 07, 2008

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Usually this problem comes due to static on the motherboard..

do the following..

1) unplug all the cables from the back of the tower incuding the power cable..

2.) press and hold the power button of the tower for 15 seconds.

3.) just plug in 4 basic cables that is monitor, power, keyboard and mouse.

switch on the computer it should work.. if not let me know with the model number of you HP CPU

All the best

Posted on Jun 06, 2008

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Provide detailss about your system
before you conclude that its an issue with video card
do the following steps
disconnect the monitor cable from your computer (BLUE VGA CABLE)
if you get a power on self test
a colored box moving all over your screen
it will make sure the monitor is working fine
if you don't get any display on monitor its a monitor which needs to be replaced

for part number provide info regarding your computer
if its a DELL provide the service tag
you will find a bar coded sticker which has a 7 digit alphanumeric number it clearly says SERVICE TAG on a DELL computer

Posted on Jun 06, 2008

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F their beeps and the led of your system unit is blinking it migth be.. or the video card is not properly install in the board

Posted on Jun 06, 2008

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Posted on Jan 02, 2017

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After installing new ATI HD4670 video card on my Gateway zx6810 I boot system hear no beeps computer powers on but screen is black


Is this new video card the only video source on the PC (i.e. there is no other VGA connections on the PC)?

Without knowing the make and model of the PC, I will list the most common issue when replacing the video card in a PC.

1. Connect the monitor to each available VGA connection and boot the computer - to see if any VGA output is working

2. When you find a working VGA output, go into BIOS and change the VIDEO settings to either allow BOTH the onboard and add in video OR allow the add in video only. Save the changes and turn the computer off.

3. Move the video cable to the add in video card, turn the computer on and see if the BIOS is using the new Video card

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I have a new geforce 6200 evga hd card and have installed it in a PCI slot after first having disabled my ASUS integrated ATI 3300 video through the device manager before powering down and installing the...


I am presuming that the mainboard is an Asus model with integrated VGA.

In order to perform the following steps you may have to remove your new VGA board and reconnect your monitor to the mainboard VGA in order to have a display on your monitor.

If your new VGA board is an AGP or PCI express, connecting your monitor to the new VGA board should have been detected and applied the VGA output through the new board. If the new VGA board is a PCI type then go to the new steps to make changes to your CMOS via the BIOS settings.

If not the Asus mainboard may have to have the CMOS setup change through your BIOS settings.

Upon bootup you should be able to hit the delte key and the BIOS screen should come one.
Scroll down to the a view that will show "Onboard Settings" or similar wording.
Select and disable the Asus onboard VGA or video.

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Good Luck

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When the monitor is turned on it appears to work - the "acer" name comes up and then the words "no signal". As soon as no signal comes on the sceen it goes to black and the light turns...

You might have one of several problems.

Your monitor might require a driver for your computer/graphics card in order to show up.
Your monitor's input might be slightly damaged.
Or your graphics card might not have the proper drivers in order to display on that kind of monitor.

I would go online and make sure your drivers are up to date for your graphics card first, then inspect your monitor to make sure no pins from the cable have broken into the input, and then make sure that your monitor is compatible with/without drivers to your graphics card.

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How to install a video card,

Find the drivers for your video card that you want to install and get them on the computer before you change cards. Once the driver is on the computer, then you ready to begin. Don't change the drivers to the new one just make sure that its available on your operating system.

Disconnect all cables and power supply from your computer. Press the power button and hold it in to release all energy from the pc. Remove the side cover to all access to the inside of the pc.

Look for the card that has the video connection where you had your monitor connected. Remove the two outside screws on the metal bracket on the back which holds it in place.

Pull the video card out away from the pc towards you. Sometimes you need to wiggle it in order to get it out. Some cards have additional cords which connect other places. The majority that I have seen do not. If your card does, take a permanent marker in order to mark where they connected so that you can remember later.

Insert the new card in the same place where you removed the old one. Put the two screws back in the rear metal plate to keep it in place.

Put the side panel back on. Reconnect all cables and boot it up.

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Replaced video card. Now sysyem won't turn on.

Did you connect you monitor cable to the new installed video card. You need to connect you monitor cable to the new installed video card. You need also to installed the CD driver of your video card.

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Navigating Bios blind to change boot order for video card

If the mainboard has onboard video, have you tried connecting your monitor to that output..?

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I turn on my pc all fine screen says no signal help please

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lilsidetrack -

An obvious cause is that your video card may have taken a dive on you, and it needs to be replaced. If you don't "see" anything on boot up, but what you hear sounds like it's booting, your video card has probably gone bad.

Another possibility is that your video card's settings got changed accidentally, and it's not sending the proper signal to the monitors you've tried. Try booting into Safe Mode (if you have a Windows OS). This loads only the most basic drivers, and if it successfully enters this mode, indicates that your video card is probably OK, and setting might be the issue. Press "F8" during boot-up to get the boot menu, and choose Safe Mode.

You don't say what kind of card or monitors these are. Does your video card have a "TV-OUT" or "S-Video OUT"? If so, the video card is probably set to output to one of these other sources, and not to the monitor. Once in Safe Mode, you can go to you video settings and be sure they are set correctly.



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