Get over it man.
Yes bad luck it only lasted 18 months,its no use posting and reposting on these forums,no forum member is going to feel sorry for you and give you another laptop,its like your wanting some sort of magic answer to your situation.
Contact Dell and tell them how you think it was a faulty part and you think it should be replaced for free 6 months out of warranty,you never know,they might do some sort of goodwill claim or something,I wouldn't hold my breath though as they give a 12 month warranty for reasons like
A.The inspirons are cheaper than the equivilent latitudes/precisions which have a three year warranty
B.where do you draw the line as far as replacing out of warranty items,18 months,17 months and 1 day,3 years,10 years.
C.Dell can't give warranty on things forever,they don't know how something has been used,you might have used it a couple of times on a bed or something and blocked the air vents by accident,damaging the system enough that it fails after a certain time frame,or you could have overclocked,I think they and every other brand work on the theory that when something is new,consumers tend to look after things a lot better than when they are a couple of years old.
I've had bad luck with HP products,but I don't have the cheek to think that the warranty I accepted at the time of purchase doesn't apply to me.