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Odd problem and only happens with turning my PC on. I press the on button, it boots up for 5 seconds, then shuts off (like it looses power). After normally 3 trys, it boots up fine. I thought it might be the PSU not supplying enough power to components? It can also have an effect on USB components like modems, with low power, shutting off.

How can I check, fix it?
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