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Laptop Screen Flashes on & off


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6 replies to this topic

#1 Poppa

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Posted 15 December 2011 - 12:44 PM

OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel® Core™2 Quad CPU Q9000 @ 2.00GHz, Intel64 Family 6 Model 23 Stepping 10
Processor Count: 4
RAM: 4063 Mb
Graphics Card: ATI Mobility Radeon HD 4650, 1024 Mb
Hard Drives: C: Total - 238472 MB, Free - 192932 MB;
Motherboard: Quanta, 3624
Antivirus: AVG Anti-Virus Free Edition 2011, Updated and Enabled

Had similar problem several years ago which was caused by malware. Hence this thread:-

Have reseated HD & RAM, checked wiring to screen. All Ok. Video card seems OK as it works perfectly on separate monitor.
Flashing sometimes starts at boot and other times allows me to get to desktop. If I am able to click icon on desktop, software will usually open and work OK. Othertimes I cannot get past desktop. I am currently using laptop with separate monitor, (TV).
Laptop screen will come on and off but not to a regular patern.
Have scanned with AVG, Spybot, Anti-malware, nothing found
Any help will be much appreciated.

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#2 jhayz

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Posted 15 December 2011 - 07:17 PM

Have you considered removing one stick of RAM module, safemode or the LCD screen itself is faulty?

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#3 Poppa

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Posted 17 December 2011 - 01:43 PM

Ram tests OK. Safemode does not show much as screen stayed on for half an hour then started acting up again. Could this be a virus??

#4 jhayz

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Posted 17 December 2011 - 10:43 PM

Try borrowing another power supply unit. Must be greater or same wattage.

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#5 abauw

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Posted 18 December 2011 - 04:21 AM

Could you tell your Laptop Brand and Model?

Edited by abauw, 18 December 2011 - 04:24 AM.

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You don't have to close your eyes to dream :busy:
You can find escape inside this moment :smash:
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#6 Poppa

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Posted 18 December 2011 - 10:27 AM

Power supply is stable with or without battery.

HP Pavilion dv7-2040us Notebook. Details at top of original post.

Thanks for suggestions to all.
I ran HP diagnostics last night and computer acted perfectly during test. Started acting up again afterwards though. Working OK at the moment.

#7 lindevi

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Posted 18 December 2011 - 01:15 PM

My reed switch (I think that's what it was called) was bad on my old Dell laptop. Basically, the part that detects whether or not the cover is closed fails. It thus turns your screen off randomly, and moving the cover up/down sometimes fixes it but not for long.

It would explain why the TV is fine but your laptop is not.

I ended up sending mine back to the manufacturer and they replaced it for me, but you could probably find the parts and replace it yourself.




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