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there's no way all three can be out at the same time
but i'd probably start with HD since it's usually the most common. you'd benefit from the extra space in the future anyways (and if it isn't your HD at least you'll have 2 HDs)
if you computer isn't booting up still, like you can't hear the fan from the power supply or any indication of boot up, then replace the power supply. spend a bit more and grab like a $30 power supply instead of the $15. you don't want to run the risk of it short circuiting the reset of your rig
if neither of those work then a mobo. is probably your cause. make sure it has a slot compatible with your current processor to save some money, as well as same ram slots.
i listed in that order since hds are cheap and common problem. power supplies are relatively cheap. and mobos as last resort since they're more expensive and take a bit more work to replace.
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