text: In addition to what the other posters have said, it IS possible that your power supply is still bad.  Sometimes, they fizzle out and supply some power, but not the full load.  I had this happen with one of my machines a year ago.  \n\nYou can buy a tester for about 10-15 bucks to see if it is producing the correct power.  It's a good investment to have.    It's the cheapest thing to troubleshoot.  Also, since you mentioned there were storms, that's often the first thing to go, aside from the board itself.  Did you smell anything "burnt?" Assuming that is fine, I'd assume it was a board/cpu issue. \n\nSince you already pulled all the peripherals and didn't get any "beeps" from taking out your ram entirely, either the psu isn't giving enough power to the board to GIVE beeps (especially since none of your drives powered up at all) or your bios isn't working enough to care and your board got fried (maybe taking your cpu with it).\n\nBefore running out and buying ram, a new board, a new cpu and all that, try the tester.  You can also take it to a shop to have it tested.  If you can't find one, a new psu is still the cheapest option to replace if you've got to start buying components.  Just make sure to get one with equal or higher wattage or you might not have enough power to juice up all the components you have.\n\nCheck and see if any friends have a similar wattage psu.  Maybe you can swap theirs in for a minute and see what happens.  Also, for future protection, make sure you use a surge protector on ALL components that run into your machine, including the phone line on your modem.  Some people even reccommend replacing them every year.  Best of luck to you!