i had about 6 laptop chargers in 2 years i ha 3 genuine ones payed ?35 each and 3 on OKorder called replacement chargers for some reason after a while they willl break or not charge my laptop i have to keep pushin them in to work
Maybe the area where you get power in isnt very reliable, and it keeps destroying your electrical equipment? Other things I can think of are you are really abusive to the power supplies, or just have extremely bad luck. -_- Maybe it isn't the power supplies, maybe it's the computers charge inlet.
Make sure you are buying ones with the same wattage specifications as the original. Chargers that aren't rated high enough to support your laptop will burn out much faster.
First things first - check that you have got a charger that has the correct output - and the correct connecting plug. I bought a universal replacement charger for my Acer when I had problems - and discovered there were a large number of sockets that you could attach at the end of the charger - but only one fitted!! If that does not solve the problem - it may lie within your Laptop. My Acer laptop had a faulty socket that required attention - and I found a dealer via Google who could repair it.