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,
Eileen

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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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Don't throw out that computer or replace any components just yet.

After much trial-and-error, I finally figured out the solution for this common issue with certain HP Pavillion models. It turns out to be a design flaw with the front-panel memory card reader. Somehow the card reader's firmware gets scrambled, and it prevents the computer from booting. You can test this on your machine by temporarily disconnecting the card reader cable at the motherboard header. Voila - I'll bet you $1 that your computer will now boot!

The solution is buried deep inside this HP tech support document. The card reader firmware needs to be reset.

Here\'s how to fix it once and for all:

1) With the computer power unplugged (duh), open up the case & disconnect the card reader cable at the card reader itself - NOT the end that connects to the motherboard header. Make sure the cable end is not touching any metal components before proceeding to step 2 (another duh).

2) With the cable still disconnected, fire up the computer. The tech support doc says to let it boot into Windows and stay there for about 5 minutes.

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4) Turn your computer back on - your memory card reader will work and, most importantly, the computer will no longer hang at POST!

I suspect that when you fire up the computer without the cable connected, the card reader is designed to reset its firmware by grounding out through the case - sort of like a CMOS Reset jumper on a motherboard.

I hope this solution is helpful to others.

best,
JohnB

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