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Get quick access to guides, parts and answers for your devices
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If your laptop only came with a black wire, it should be fine just to re-connect that. The white one looks like it's a second antenna, so that might not be present in the 5742G model of the laptop - mine was a 5742Z, and it's what I used to create the guide. As always, your mileage may vary - but let me know how it goes and I'll update the guide.
As a quick warning for noobs (that'd be me before I attempted this repair :P ), you need a matching pair of RAM (two chips the same size and spec). Otherwise, the computer won't boot up. ^_^