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Hp laptop blank screen/black, despite power lights on.

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I see this a lot at work. Here are the steps I go through to TS.
1. Make sure the computer is off 2. Unplug the AC Adapter and remove the battery 3. With nothing attatched to the laptop (including battery) press and hold the Power button for 15-30 sec. 4. Plug in the AC adpt. to the unit and the wall (leave battery out at this point). 5. Turn on the unit. At this point it might turn on (I've had about 50% success on this). 
If this does not work and you are still experiancing the same issue you computer may be under HP's Limited Warrenty Service Encancement. Which is basically a recall by all means but don't call it that. HP will throw a fit and won't help. Seriously. They are going to want to check your model number and your product number. 
Finding these is simple. Look on the back side of the unit and locate the sicker with 2 barcodes on it. the number labeled "P/N" is your Product Number. The official HP Model Number is located directly above the word warrenty. Example: DV6312US.
You can also look here on HP's website for more information the the LWSE.

Posted on Nov 03, 2008

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Hp touchsmart 520 when i press the power button the blue light come on sound like it turning on but a blank black screen done this from new


Let it power on. If it plays the normal windows music then look very carefully at the screen. You may need a flash light. If you see a faint image then your inverter board or back light have burnt out. It will a small board 1 x 2 inches usually and have a small wire coming from the power supply and one going to the bottom or top of the screen.

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Instructions Things You'll Need:
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  1. 1 Check the power source. While you have presumably already attempted to turn your laptop on and off, the problem may lie with your AC power adapter. Is the power-indicator light on the adapter on? If not, your problem may lie here. However, whether or not you have a power indicator light on your adapter, consider unplugging it and plugging it into another outlet. This may turn on your laptop and take care of your blank-screen problem.
  2. 2 Check your brightness settings. While it seems like a simple oversight, the brightness on your laptop may sometimes be turned all the way down. Thus, the screen appears to be black, off or defective, when the problem is simply that the brightness is on its lowest setting. To fix the brightness, check your laptop keyboard. Most laptops have the brightness settings mapped to two keys at the top left of the keyboard, accompanied by a symbol (often a sun). Use these keys to fix your brightness, but keep in mind that some laptops require that you press the Function key at the same time as the Brightness key.
  3. 3 Check the status of your laptop battery itself. There should be a battery indicator on the laptop that is connected to the battery. This indicator is either on the bottom of the laptop or (likely) on the side. If there is no indicator, your battery itself may be the problem, and may require replacing. Keep in mind that older batteries of the nickel-cadmium variety are more likely to decharge over time and forget their initial maximum charge level; this may be a particular issue to users of older laptops.
  4. 4 Find a VGA connector and hook up your laptop to an external monitor if the above steps have not alleviated the blank-screen problem. Turn on the computer and the external monitor. Does the external monitor light up? If so, the blank screen is likely due to a video subset problem/LCD problem in your laptop.

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You say the laptop all of a sudden flashed off.

How old is the laptop? You may have suffered one of two things? First of all, if the hard drive will not boot back up, even after using the recovery discs, then that would explain it powering off. I have seen this happen on old desktop hard drives.

Next, try to get the transformer or adapter tested. It may not be putting out enough amperage to run the laptop.

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Hi civic-95-uk ,

Try performing power drain steps on thenotebook:

1) Remove the AC adapter and battery from the notebook.
2) Press the power button and hold it for a minute.
3) Reconnect the AC adapter, battery and try starting the computer.
Even if the issue is same then perform Hard drive self test from BIOS.

1. Turn on the notebook and press F10 immediately. Which will lead you to the BIOS setup screen.

2. Click on Diagnisis and choose hard drive self test. Perform both the short test and long test.


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