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I have an hp pavilion a642n and when I turn it on I hear whirring, but there is no picture on the monitor. There is a "no signal" line than quickly turns off. Help

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Its probably faulty ram if its a onboard video if not turn off and remove video card and reseat it

Posted on Jul 12, 2008

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My lap top was working fine yesterday , but when i went to turn it on today the startup said to use "run in safe mode " or others options similar to that , i chose one , & it still didn't...


Hi, sorry to hear you are having problems. 1. Start up your desktop as normal but as soon as it starts keep pressing the 'F8' key. 2. You will have a black background with white writing on and lots of options. 3. Use the up and down arrow keys and select last known good configuration, then press the enter key to select it. philswift_4.jpg
Your computer should start up. If you have a blank screen, do you hear the fans whirring and see lights on the front? If so then your computer works but is not sending s signal out to the monitor. Check all cables to make sure they are securely connected. If you still have no image. Swap your monitor for a friends one that you know works. This will test if it is your monitor that has failed. If you see an image on your friends you will need a new monitor or new monitor cable. If you do not see an image on your friends monitor and your PC has lights and fan whirring then you need to get a new graphics card. If you have no lights and no fan whirring it is outside the scope of this and we need some more information as it could be 1. Failed power supply 2. Failed memory 3. Blown motherboard 4. Failed processor
Please report back with answers to 1. Do you hear fans whirring? 2. Do you see a power light/led light up? (in example pic it is green) 3. Do you see the HDD (Hard Disk Drive) LED/light flash at all? philswift_5.jpg

Many thanks for your information
Phil

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Hi ,

If the green light comes on on the front panel then it means the fan is spinning so what u can do is a self test for the monitor.Disconnect the vga cable from the back panel of the computer tower and then check if there is a message displayed on the monitor that should say check video signal or no inoput signal ,if there is no such message displayed then it means the monitor is a fault .If not then reset the memory card and then check .U can also run a test for the motherboard to do this u will have to remove the memory card and then turn the computer on if u hear long beeping noise it means the motherboard is fine .If u dont hear any sound then the mother board needs to be repaired or replaced...

all the best

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