I have a MacBook pro that is about 4 years and its power adaptor broke it says on it 85W. Do you think if I get the new 60W ones it will work? Will it affect my computer?
The 60W should be OK on the MBPro. The Output on it is 16.5V-3.65A.
The 85W MPBro charger lists two outputs:
18.5V-4.6A and 16.5V-6.5A
Not sure why or how it's rated for two outputs; maybe an EE could explain..
I believe the caveat to using a 60W charger on a MBPro is that your battery may not charge while you are actually using the laptop. Should charge while it's off or asleep..
Might be careful the other way around though ( 85W charger on a Macbook ) ... though I have to believe Apple would have stickers on the chargers and KB's explaining that it shouldn't be done if there were a serious issue..
At best it will charge slower, at worse it won't charge at all. I wouldn't mess around with different wattage chargers.