Fresh build - Computer will not stay on

[Pawnzer56]

I just helped my roommate build his first rig and when we went to turn the thing on it only stayed on for a half second then it would turn itself off. Here is a list of the things we have tried and the specs.

-disconnecting everything (sata cables, usb cables,GPU, trying to only run what was necessary)
-taken the mother board out of the case and trying to run it just sitting on the anti static wrap
-moved the ram around
-removing the cpu and heatsink and then putting them back on

-msi z97 gaming 5 motherboard
-Geforce GTX 760
-8gb of ram
-750w rosewill PSU
-I5 4430

I dont have a spare PSU or motherboard to try and see if either one of these is bad. I was hoping maybe someone else had an idea on what to do (besides getting newegg to send replacements.) Thanks for reading and any help would be greatly appreciated.

 

[plaintuts]

Place the Mobo on top of its box

Connect 1 stick of ram

Use the onboard video output

Dont plug any hard drive or SSD

Turn on the system then check if it will post the bios.

 

[byza]

Sounds like you've missed the CPU power cable. It's a 4 or 8 pin connector in the top left of the motherboard near the CPU socket.

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[Pawnzer56]

Sounds like you've missed the CPU power cable. It's a 4 or 8 pin connector in the top left of the motherboard near the CPU socket.

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

yea that was it cant believe i forgot that, thank you for the fast responses.

 

[byza]

No problems. It's an easy cable to miss, a lot of new builders miss it. I think because the 20+4 cable is so big you wouldn't think that the motherboard needs another power cable. Fortunately it's easy to diagnose.