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  Laptop screen randomly blinking/dimming. 
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jason sneed Oct 27, 2006, 01:15am EDT Reply - Quote - Report Abuse
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Recently only at my workplace my laptop screen has started blinking/ dimming for a split second. As you can imagine this is really annoying. The only thing I can think of is the power there is not strong enough for our needs and my laptop is dimming as it would when I unplug the ac adapter. Any thoughts on this?

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john albrich Oct 27, 2006, 04:18am EDT Reply - Quote - Report Abuse
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>> Re: Laptop screen randomly blinking/dimming.
If there isn't a major difference in the ambient temperature near the power brick, and it happens ONLY at that one location, then it does strongly suggest the AC mains is the problem. It's likely caused by major sags below the ability of the brick to compensate.

Your outlet may be sharing power with a huge power sucker like a few laser/toner printers, and when they're printing...the voltage sags.

You could try these things:

A different power brick (various office supply and computer stores sell them anywhere from US$25 to US$100 (WAY overpriced) )

Use a UPS that compensates for low AC mains voltage with Automatic Voltage Regulation. A low power quality UPS sufficient for a notebook will run maybe US$60. For example, the input AC voltage may vary from 90VAC to 130VAC but the unit outputs a constant 115VAC.

Use a surge/sag protector that doesn't provide backup power, but does compensate for voltage variations.

You might also want to get the power checked by a pro as this could indicate an underlying safety problem as well (a poor connection, damaged wiring, etc)

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