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Pc don't boot up and the monitor starts up then powers off. i hear the hard drive start up

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  • mosrite0795 Jul 17, 2008

    Last evening I downloaded an updated bios driver for my Dell Dimension 8400 desktop. When the driver installed, the computer rebooted automatically. When it did, the keyboard lights flashed then went out, the monitor screen was black, there was intermittent buzzing from inside the computer, and the fan sounded like a 747 taking off.

    I removed the four memory cards and reinstalled them but nothing has changed I haven't slept all night worrying about the data on the hard drive. Can anyone suggest a way to get this computer back to normal?

    Thank you.

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If your PC don't boot up but the monitor starts up the problem is from the hardware. I will give you a tip how to troubleshooting this problem replace the memory of your pc and put a good memory that the same frequency if your computer boots up your memory is damaged, but if the troubles is the same try to change the video card and then try to power it again. If is does not work email me again for some tips.

Posted on Jul 01, 2008

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Error why coming


Can you hear any fan or drive sounds? If you don't hear anything at all when you try to turn the laptop on, no little LED's light up, the problem almost certainly isn't related to the hard drive. So if you don't have a live screen, start with the LCD troubleshooting flowchart, and if you don't have any activity at all, start with the power troubleshooting flowchart. Even if the hard drive has failed at the electro/mechanical level and won't spin up, this wont prevent the LED's on the laptop from lighting up, or the LCD from displaying the BIOS information and complaining about the lack of a boot device.


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1 Answer

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Normally if the hard drive is bad you will get some type of message on the screen.

If it sounds like it is running but the screen is blank, then try another monitor. Maybe the monitor is bad. Try another monitor. Borrow a monitor from a neighbor, friend, relative or co-worker and put it on the computer. If the borrowed monitor works, then your old monitor is bad. If the borrowed monitor does the same thing, then your video card is bad.

If it does not seem like it booted up all the way then try the steps below.

When you plug in the power cord is there any lights whatsoever on the laptop, where the plug goes in or on the AC Adapter of the power cord?

When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the laptop is trying to boot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the laptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe your power cord is bad if you don't get anything to happen whatsoever when you press the power button. And if that's true maybe you was operating off the battery the last time you had it on and since the power cord is bad, it was not charging the battery so the battery is drained and the power cord is bad.

Maybe you have a Static Charge Buildup. Remove the Power Cord, Then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in and hit the power button to see if it boots.



Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

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1 Answer

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If you hear the CPU fan turn on that doesn't mean the CPU itself is working. It can be only that the motherboard is getting power. Check all your connections such as monitor and peripherals and re-connect them. If you still don't get P.O.S.T. or ANY letters or boot options on your screen then your CPU is dead. (unless your monitor is bad)
Another easy diagnostic is using your ears. For example the pitch sound of the fan in some motherboards tends to lower and then increase because it's reading of the hard drive. This means your CPU is ok but either your graphics connection is bad or your monitor is.

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Do you hear the harddrive start up? When you push the power button (or switch on the back) do the lights go out? If you hear fan running and hard drive start up then the computer itself might be on but the monitor isn't. Check the power to the monitor, the connection between monitor and computer to make sure they are all on and connected.

If you don' t hear the fan running then you have other problems. Any blinking lights would indicate something is getting power. I'm assuming the computer was working before the power button was pushed... If the monitor is actually working, you could hook up another monitor to check too then you have other problems but need more info to know what that could be.

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Is the IDE/SATA cable attached to the hard drive AND the motherboard?

Are the connections tight?

Is one end of the cable reversed - does pin 1 on the hard drive correspond to pin 1 on the motherboard?

Are the jumper settings on the hard drive set properly - Master/Slave/Cable select?

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This could be the monitor cable came loose from the tower (this is our favorite, because it is such an easy repair), or something on the motherboard (that is, anything) that is not functioning and preventing your computer from starting.

Unplug the connecting cable, and plug it back in again, making sure that it is seated properly.

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