New build boot - loop :(

[60fps]

Hi all,

I have recently put together my new build (LGA1151 Gigabeyte B150N Wifi Board, 16GB DDR4 RAM, I5-6400, Thermaltake Core V1 case, Super Flower Golden Green HX 450W PSU, Samsung EVO 850 250GB SSD and 3TB Toshiba HDD) and it did not boot properly. It boots up all the fans spin (PSU, Case and CPU), then the CPU fan slows down and it turns off. After a few seconds it turns on again, then it loops between booting up, then off again for a few seconds.

So far I have:

- Checked all cables and connectors (inc the case power connector to the right pins on the Mobo)
- Removed heatsink and inspected the CPU - seems fine and was seated correctly
- Tried new PSU
- Tried new RAM
- Disconnected everything apart from the motherboard apart from CPU power connector from PSU, case power on switch and the main 24 pin power from the PSU. The motherboard was taken out the case and put on top of the anti-static bag it came in.

Could you please advise. I'm thinking it may be the Mobo, shall I get a replacement?

Many thanks!

[virtuo]

Sounds like you've tried pretty much everything, have you tried powering it up with just one stick of RAM - I had a similar problem with it powering down before POST and it was badly seated RAM - could be a faulty or damaged slot?

I'd also check there's nothing shorting on the board (front and back)

[Phage]

Could be the Bios. Have you reset the CMOS ?

[60fps]

Yes tried one RAM piece, as well as a stick of new RAM too.

I'm sure the RAM is properly seated, made sure to push down properly. Could well be a damaged slot though. Any idea if it should still boot up a bit better without RAM inside?

I removed the Mobo from the case and put it on the floor on a anti-static bag, would that take care of shorting? also are there other ways to check for shorting?

sorry for all the questions

[60fps]

I believe so, remove the battery connection from the Mobo for about 30 secs - 1 min. Also touched the two jumper pins with a screw driver too - that's what I read somewhere online for the jumpers.

[wazzickle]

RMA time, imo.

[Phage]

Yes tried one RAM piece, as well as a stick of new RAM too.

I'm sure the RAM is properly seated, made sure to push down properly. Could well be a damaged slot though. Any idea if it should still boot up a bit better without RAM inside?

I removed the Mobo from the case and put it on the floor on a anti-static bag, would that take care of shorting? also are there other ways to check for shorting?

sorry for all the questions

Better on an old cardboard box. Those bags are conductors to dispel any static charge, so may possibly create a short.
Sounds like a corrupt BIOS though.

Gigabyte boards have a dual BIOS, so there may be a switch to move to the backup. I can see the two chips on the pics opf the mobo, but no switch. Maybe try this method ?

http://forum.giga-byte.co.uk/index.php?topic=9462.0

[60fps]

The Mobo?

[CAT-THE-FIFTH]

Try another PSU?? Haswell and Skylake have low power states which have been known to have issues with certain PSUs.

[60fps]

Many thanks guys, It was the RAM, I thought I had it the right way round and seated properly. Installing Win 10 as we speak.