Gigabyte GA-P55M-UD2 Motherboard
Intel Core i5 760 CPU
ATI Radeon HD 5850 GPU
I really don't know what's gone wrong. After playing with the overclocking settings I had it running at 3.5GHz at a decent temperature for about 5-10 minutes after which all the power cuts out. No BSOD, no reset, just no power. I had had it higher earlier but was a little concerned about the heat so I opted for a lower overclock.
I tried to power the PC back up and nothing happens.
After turning off the power at the back of the PC for a little while then turning it back on again and attempting to power up, things started for a fraction of a second, some motherboard lights flashed on, fans twitched, then nothing again. Leaving it powered off for a few minutes made it repeat this process when I turned it on, attempting to turn it on again before then I didn't even get that brief power.
After trying various things without avail, I started unplugging things. Unplugging the 4x2 CPU power then attempting to power up the power came on for 2-3 seconds, then again cut out, it would continue to do this until I switched it off.
I'm using an OCZ 600W ModXstream PSU.
I've tried resetting the CMOS both via the jumper and by removing the battery for a few minutes, nothing helped.
Does this sound like a bad overclock / faulty PSU or something else?
unplug everything you can, gfx cards (unless you need that for monitor I.e no onboard gfx), hard drives opticals
try booting with only the 20+4pin and the 2x4cpu power pin in,
theres a breadboarding guide on here somewhere but I'm off out I'm afraid atm, i'll check back in a bit man,
I've removed everything, tried booting with 1 stick of ram and no ram. Results were no different to when everything was plugged in.
Can't get into the bios.
The motherboard leds flash on but go off straight away.
The system beeper is attached but it doesn't beep, doesn't stay powered long enough to get to the POST test.
PSU fan doesn't move.
Ok, You've jumped the 600w psu and its working?, http://www.thermaltake.outervision.com/
Fill this in with your system specs and see what it says, I think your 300w box hasnt got enough for that 5850,but you may be able to at least get into bios, worth giving it a try I reckon
see what you need and then maybe its shopping time for a new upgraded psu,
I know a lot of people on here have had issues with Ocz psu's, you may just have a bad one, dont mention the overclocking to the rma people though imo
Hopefully it is putting out that 380 Watts but if thats what you have,
try that psu in there, run the minimum you can to do it, as before on the breadboarding just to check if you can post/boot ok, I'll check back later when I get up
I don't like OCZ PSU's. Right now, I think they are marketing 4 different PSU lines. The newest line is supposed to be their attempt at a truly good PSU (the jury is still out). One is pretty good. The other two are barely OK. And I can't remember which ones are which.
My memory is just not it used to be. Of course, at over 60, neither is anything else.
Couldn't try the 380W PSU, It doesn't have the 2x4 CPU power connector, only a 2x2.
With the OCZ PSU I don't get any thing with motherboard, CPU & HSF, PSU, and system speaker connected, if CPU power is connected it turn off instantly, without it connected it enters a cycle resetting every few seconds.
Haven't had time to try the OCZ PSU in another PC yet.
You should be able to use the 2x2pin from the 380W unit in there, just use the pins/sockets closest to the floor/desk when the Rig is stood upright,
My Mobo's got an 8pin cpu socket but My psu only has a 4pin cpu line, works fine