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I’ve have been having power problems with a new computer that I recently put together. The system included:

  • Thermaltake Level 10 GTS case
  • Asus Sabertooth Z77 motherboard
  • Asus Geforce GTX 660ti video card
  • 32GB Corsair Vengence XMP memory
  • Thermaltake Water 2.0 Extreme cpu cooler
  • Samsung 840 Pro 128GB SSD
  • Western Digital Velocitor 1TB HD
  • LG Blu-Ray Optical Drive
  • Seasonic X-Series (SS-650KM3) PSU

When I first started the system up it began a cycle of repeatedly shutting down and starting up. The timing of this shutdown/startup sequence was around 7 or 8 seconds per cycle. I cannot get the system to power up long enough to get to get past POST to the boot screens.

I stripped the computer down to just the motherboard, CPU and Seasonic power supply. I disconnected/removed the XMP memory, CPU Cooler, SSD, HD, LG Blu-Ray, and ASUS video card; and tried to power up again and the system still cycles on and off. I then received replacements for both the motherboard and CPU, reinstalled then and am still experiencing the same problem.

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It could just be a broken power button.. push on, stays stuck down, after 5 secs it shuts down. – NickW Jun 5 '13 at 16:08
Check the error lights on the motherboard to see if any are lit – Journeyman Geek Jun 5 '13 at 16:25
If it still happens after replacing motherboard and CPU, the problem can be in the case: a faulty power button, a problem with the power supply... try changing that. – woliveirajr Jun 5 '13 at 19:09

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