Question about Lenovo ThinkCenter M52 PC Desktop

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My monitor keeps flashing on and off every few seconds I connect my computer to a external screen and it keeps flashing on and off.

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Power consumes more that's why is on and off

Posted on Mar 10, 2009

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The monitor maybe faulty, try the monitor on another computer/laptop, then if it still flashes then then monitor is faulty.

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You can switch to an external monitor or data projector by two methods. 1. Connect the external monitor to the laptop's video port, power up the external monitor first and the laptop. The video information will automatically switch to the external monitor. 2. If you power up the laptop first then you can switch the video output to the external monitor by pressing the Fn key and one of the Function keys, depending upon your make and model laptop. You can also toggle between the external monitor or both LCD screen plus the external monitor or back to LCD screen only by pressing the Fn key plus one of the function key a few times. Here is a list of key combinations for some of the laptops :- IBM ThinkPad = Fn + F7 HP and Compaq = Fn + F4 Toshiba = Fn + F5 Dell = Fn + F8

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Check to see if you have inadvertently hit the CRT button which turns off your screen to turn on an externally connected screen even if there is no external screen plugged in. OR you could have a bad (Back-light) or (Inverter)

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Press "Fn+F7" once, wait a few seconds, and press it again, to "cycle" through all the possibilities (LCD-only, VGA-only, both).

Try the monitor with some other computer (desktop or laptop) to see if the monitor works at all.

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Today I noticed that when turning on computer, after 1-2 mins the screen goe black and I cant see anything. I noticed in the past month that occasionaly I get lightening flashes in the background. this...


To determine if the LCD screen is faulty ot the video card, connect an external monitor to the laptop's video port. Power up the external monitor first and the boot up the laptop. The video image should automatically switch to the external monitor. If you don't get flashes on the monitor then the video card is OK and the fault lies with the LCD screen. Flashes coud be caused by a faulty inverter or a faulty CCFL lamp. A fault is usually easier to diagnose when it is not intermitten.

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no it is a few bad capacitors on the vga board internal thes need tobe replaced or you can return the monitor if it is less than a year old

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CANNOT COMPUTE!!!! NEED MORE DATA! Is your monitor the problem or the computer? Try connecting the monitor to another computer. You can also try connecting a laptop with an external video adaptor to the monitor to test it.

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At first glance, I'd say "bad video/motherboard" ...however, when you hook up an external monitor, you also need to first switch into "external LCD" mode. On the Dell laptop, hit FN and F8 I believe to switch between LCD and external. It will go through several modes...LCD only, external only, neither, and both. Keep switching until you see something on the external.

If you never see output on the external, you've got a video/motherboard problem. If under warranty, contact Dell and place a support call.

If not under warranty, you're looking at anywhere from $200-$400 for a new motherboard, plus labor for someone to install it.

Hope this helps - remember to rate :)

Experience:
- A+ certified technician
- 8 years as IT/manager of a 100% Dell-supplied company, with over 1,500 Dell volume annually
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