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Posted on Jun 17, 2017
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My brand new Serfas USL-1 USB rechargeable headlight, 12 lumens, will not light up. I charged it completely (the blue light went from flashing to constant while in the USB port - after several hours). I've tried holding in the power button for quite a while, etc. Unfortunately, I lost the instructions that come in the box. It does flash - momentarily and sporadically - when I push the power button (and it didn't do even that for quite a while).

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Donald Ayers-Marsh

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  • Cycling Master 1,389 Answers
  • Posted on Jun 17, 2017
Donald Ayers-Marsh
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Check for manual online for instructions or return the unit as defective.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

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Anonymous

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  • Posted on Jul 04, 2009

SOURCE: Screen flashing

I had the same problem. You will need to put it in the car cradle and plug it into the car charger. It will come on immediately.

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Kevin Groce

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  • Posted on Dec 27, 2009

SOURCE: I have a Dell Inspiron 1525 that won't start.

This is directly from the User Manual:
If the computer is connected to an electrical outlet, the Battery light operates as follows:
• Solid green: The battery is charging.
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Anonymous

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