Blew ANOTHER power supply!

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i get back from being gone for the weekend, and i realize that my computer is turned off. so i try and turn it on and it wont. this morning i took it to tiger direct, they ran a diagnostics test on it and my PSU was dead!!! i couldnt beleive it!! my 5th one in under a year. i started out at 200watts on my first one, then 350watts on my second, then 400wats on my third, then 420watts on my 4th and 480 on my 5th and now i just got 550watts… if this one dies im gonan be pissed…