Acer Aspire V3-571-6447 :: Beeps And The Screen Dims And Then Brightens

Sep 27, 2014

My laptop is an Aspire V3-571-6447 with windows 8.1 os.For the past month or so it starts beeping and then the screen goes dim and then it beeps and brightens up again. This might go on for 3 or 4 minutes and then it stops. Is this an indication of a problem? It doesn't seem normal to me and from what research I have done it seems that beeping is not a good thing.

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 dim and brighten....sometimes as frequently as every 20 seconds. happens when im not plugged in!

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Dec 29, 2014

Whenever I unplug my laptop from external power, the screen considerably dims and the taskbar turns white over it's usual blueish black. I've gone into the power settings and changed them so that brightness is 100% when unplugged, but to no avail. According to my computer it's at maximum brightness when unplugged but it's obviously not. Trying to increase the brightness by the sun key or pressing Fn up doesn't work either. Tried to go into BIOS via F2 but couldn't find a video or brightness option.

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Model 14-d001AU  Notebook
 
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Feb 3, 2011

My x220 is driving me crazy these days. Some days ago I experienced very strange behavior of my system. I was just using the notebook as always as it started to stutter.

With stuttering I mean everything is working for 1-2 seconds then is stuck for 1-2 seconds, working, stuck, working so on so forth.

With everything I mean the mouse movement, hard disk load, graphics movement, audio, everything simultaneously. This problem does show up not only if Windows is up but also when Windows is booting or if I start a live linux distribution.

I also noticed that sometimes when I'm moving around the ultranav trackpoint the cursor jumps to one display edge and opens a context window as if I had pressed the right mouse button.
 
What I did so far:

Reboot my system several times.
Checked Task-Manager: nothing out of the ordinary
Reset BIOS to factory settings
Updated everything to newest stuff
Started a live Linux distribution instead of Windows 7
Decrypted my system (TrueCrypt)
Deactivated Power Management/SpeedStep via BIOS settings
Switched to Single-Core processing via BIOS settings
Swapping RAM from 2x8GB CORSAIR to 2x4GB KINGSTON
Swapped SSD with original HDD
Try booting windows in safe mode

I'm almost at a point to say this can't be a software issue and that it is something mainboard/CPU/GPU related, but I want to be certain before contacting the support.

Another thing I noticed: The stuttering starts exactly when the windows logo shows up and the screen automatically dimmes itself while starting windows. Something is happening in that moment. I may need to add that I did not install anything prior to the current situation. That does support the hardware relation.

Lenovo X220 (Model: 4290-G51) | Intel Core i7 2460M | Intel HD 3000 | 2 x 8 GB CORSAIR DDR3-1333 RAM | 256GB SAMSUNG 840 Basic SSD | 9-Cell orig. Lenovo Battery 29++ (FRU: 42T4942, LGC) | BIOS V1.29 | Power Manager V6.65.1 | Power Management Driver V1.67.04.05 | Windows 7 Professional 64Bit (up-to-date)

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