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Custom build PC not booting, maybe PSU or Mobo faulty?

Hey guys,
I finished building my PC today and when I started it up to see if it would POST, nothing good happened :/ 3 hours wasted

Main specs:
AMD FX-6300
ASUS M5A97 Motherboard
Crucial Ballistix RAM (2x4GB)
Corsair CX430W
XFX Radeon HD 7870


The LEDs on the mobo and case power switch kept blinking (at same time) and the fans (case + cpu) kept spinning. It's really unusual and I'm not sure what part could be faulty. I removed both RAM sticks, unplugged the Video card and sata power cables and tried turning it on but the flashing light thing still happens. No bleep codes from the speaker so nothing was in the manual

My ideas:
The PSU might be too low wattage and the mobo is underpowered. Although, using PCpartpickers wattage estimator, my 430W PSU has a clearance of about 50W from predicted wattage so I thought it would be okay? Would swapping to a 600W PSU solve this?

Or... the motherboard is faulty in some way or form.

Hope you can help me out,
Thank you :)
7 answers Last reply Best Answer
More about custom build booting psu mobo faulty
  1. kristianAA said:
    Usually those partpickers estimated wattage isnt very trustworthy. it just add wattage numbers what are component specification in real life thigs are way different but its not bad to go trough all the cabeling once again and plug everything in again


    Okay I just went and reconnected everything but same problem. Do you think I should change to higher wattage PSU? Also, for some reason the case power button doesn't do anything. The lights still remain flashing whether I press the power button or not. Only way to stop it is to turn off the PSU at back.
  2. Think so yes, that Corsair only has about 385 on the 12 Volt rail, I'd want at least a Good 450, preferably 500 PSU with about 24 AMPs on the 12 volt
  3. Tradesman1 said:
    Think so yes, that Corsair only has about 385 on the 12 Volt rail, I'd want at least a Good 450, preferably 500 PSU with about 24 AMPs on the 12 volt


    http://www.amazon.co.uk/Corsair-Builder-Series-Modular-Certified/dp/product-description/B00ALYOTTI

    How does this look? I don't know where to look for current on the 12V rail specs. This is also modular and will make cabling less of a nightmare I guess.
  4. Best answer
    That's a good one - has 45-46 on the 12 Volt, should be fine ;)
  5. Exact same problem with pretty much identical specs, so all I need is a higher wattage psu than 430W, preferably 600W ??
  6. brad2324 said:
    Exact same problem with pretty much identical specs, so all I need is a higher wattage psu than 430W, preferably 600W ??


    Yeah 430W is a bit too low, not enough amps on the 12V rail. A 600W PSU works just fine for me now.
  7. Glad to hear all is well, have some fun now ;)
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