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New build constantly restarting, every second or so. What could be causing it?

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April 16, 2014 11:02:35 AM

Today I built my new machine, reusing my old Antec 900 case, OCZGXS850 850W PSU, hdd and dvd drive.
I bought all of these new components:

Powercolor Radeon R9 280 TurboDUO 3072MB GDDR5 PCI-Express Graphics Card
Intel Core i5-4670K 3.40GHz (Haswell) Socket LGA1150 Processor
Gigabyte Z87-D3HP Intel Z87 (Socket 1150) DDR3 ATX Motherboard
1 x Microsoft Windows 8.1 64-Bit DVD - OEM (WN7-00614)
1 x Samsung 120GB SSD 840 EVO SATA 6Gb/s Basic - (MZ-7TE120BW)
Kingston HyperX Beast 8GB (2x4GB) PC3-19200C11 2400MHz Dual Channel Kit (KHX24C11T3K2/8X)
1 x Raijintek Themis Direct Contact CPU Cooler £19.99

For my first ever build, everything went pretty smoothly, but the machine is in a constant loop of rebooting. Once in a while it'll boot as normal, but not at any point have I been able to get any video output to my monitor, either DVI nor HDMI.
I've stripped the whole thing down again, so that all that's connected to the motherboard is the CPU,CPU fan, the 2 sticks of RAM, and and 24 and 8 pin PSU connections.
Same problem. Tried removing the RAM 1 stick at a time, and changing slots, same problem.
It's as if the PSU is revving. Quick blast, PSU led and fan come on, light switches off, fan stops. Sometimes there's a flickering of the fan and led, othertimes revs. But, as I said, even when it is running, there's no video output.
Any help much appreciated!

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April 16, 2014 11:05:37 AM

well that seems to leave two components left, the motherboard or the PSU. having another PSU would be the easiest to test. could be the cpu but a dead CPU is very rare. Reusing an old psu could be it, or the mb.
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April 16, 2014 11:10:24 AM

Make sure the front panel reset switch is not shorted or stuck closed.
Remove the CPU and check carefully for any bent pins. A dressmaker's pin (the long one with the ball on the end) can be used to straighten bent LGA pins. A jeweler's loupe will make it easy to see.
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April 16, 2014 11:45:57 AM

Onus said:
Make sure the front panel reset switch is not shorted or stuck closed.
Remove the CPU and check carefully for any bent pins. A dressmaker's pin (the long one with the ball on the end) can be used to straighten bent LGA pins. A jeweler's loupe will make it easy to see.

I've disconnected the front panel (turning on the machine by shorting the power-on pins with a screwdriver).
Unfortunately I don't have another PSU to try. Although it's an 850W PSU, is there a possibility that it's not powerful enough to boot up this new machine, yet runs a very old machine ok?
Maybe I should try the CPU next.


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April 16, 2014 2:56:47 PM

It is more than powerful enough, or should be. How old is it? Capacitor aging may have affected it, but it shouldn't have dropped it too much for your build.
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April 16, 2014 3:42:26 PM

Onus said:
It is more than powerful enough, or should be. How old is it? Capacitor aging may have affected it, but it shouldn't have dropped it too much for your build.


It's a good 6 years+ old, and hadn't been used at all for a couple of years, until recently. It's out of my old machine, and it was running that machine fine, just a couple of days ago.
And I've tried it on the motherboard of that old machine again today, with no problems.
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