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Thanks all for the advice, it seems to be the motherboard, I'm gonna write off this machine not worth replacing motherboard.
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Thanks all for the advice, it seems to be the motherboard, I'm gonna write off this machine not worth replacing motherboard.

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I have a desktop PC. When I press the power button the hard drive activity light blinks and nothing else.<br />
I have opened it up. there is a light on the motherboard labelled 5v that is constantly flashing.<br />
I've reseated the memory and there are no PCI cards.<br />
I ordered a new power supply and installed it. No difference.<br />
<br />
Can anyone think of anything else that may be causing this? Will the motherboard need to be replaced? 
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I have a desktop PC. When I press the power button the hard drive activity light blinks and nothing else.
I have opened it up. there is a light on the motherboard labelled 5v that is constantly flashing.
I've reseated the memory and there are no PCI cards.
I ordered a new power supply and installed it. No difference.

Can anyone think of anything else that may be causing this? Will the motherboard need to be replaced? 

No power even after replacing power supply

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.

Components

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.