Computers and me

I have a knack for finding items with faults. This time it was a charger. Actually, not A charger, there were 3. We have an Expert shop near where I live, my charger broke, and I bought a new cheaper one.
It worked for a few days, then suddenly the computer started turning itself off. I noticed it only did that when the charger was in, and I could get away with charging it when the lid was down. But nonetheless it's not enough to only be able to charge when it's not in use. So I took it back. I got a new one, of the same brand and after a few days, when my sister and I were sitting in the basement I realised I hadn't plugged it in. When I did, the room went black and the charger was dead.
I took it back the next day, and after a lot of unnecessary talk I got a new one. I took it home and used it at once. I had to start the computer without it, and when I plugged it on it only worked for around 15 minutes before turning the computer off.
I went back and had them order a proper HP one. I really hope that will work. Apparently I was "the only one that had had problems with them, and they had been selling these for 2-3 years now! And not one had come back!" which I find strange and have a hard time believe.

I got a tip from a friend that said "Always buy a charger of the same brand as your computer".... I certainly will after this >.<