A little less than a year ago, I bought my oldest daughter a Dell Inspiron 3147. The DC adaptor in the machine crapped out about a month ago; we sent it back to them for repair. They originally quoted us $150, which my daughter already paid; they called yesterday to say that there was a problem with the pins from the DC adaptor to the motherboard, and that they were going to have to replace the motherboard instead.
The laptop cost about $400. The motherboard replacement was going to cost $300.
I decided to buy my daughter a new laptop ($360), and repair the old one myself (because she needs a laptop for school and we need a...newer one for home). Looks like I can get a motherboard for $50; and a DC power jack for $10.
So, some laptop repair is in my future.