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You don’t want a bead of hot solder rolling around on your MOBO!! Do you mean the solder will not stick to the iron tip? Sounds like you need rosin core, acid, sum flux!
With a brand new tip you might need to flux it a bit to get the solder to bond on the tip. The worst thing you can do is use too much solder. You don’t want a bead falling on some part and shorting out an IC. Get you wire cut to length and prime both tips with solder before you go near the board with the iron. Prime both points with just a tiny film of solder on your tip, speck of flux with a toothpick if you need to. Knock any solder off your tip and fix the wire to your point. Piece of cake!
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