Power supply issue? New Radeon5850's fan runs at full speed and PC doesn't boot.

Posted by Kris on Super User See other posts from Super User or by Kris
Published on 2009-10-23T15:08:38Z Indexed on 2010/05/14 1:14 UTC
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I recently bought a new ASUS EAH5850 graphics board. I installed it a custom PC which had an ASUS p5n-e SLI mobo along with a 500w Thermaltake W0093RU power supply.

Sometimes when doing a cold boot the 5850's fan will run at full speed and the PC will not boot. Powering off by holding down the power button and powering back on sometimes remedies the situation and everything boots normally. Warm reboots also never seem to have problems. For some reason though cold boots almost always do. Another issue I notice is that when the PC does boot normally it takes longer (+30 secs) to POST than with my last video card. I flashed the mobo with the latest available BIOS but it had no effect.

Is my problem a power issue or incompatible motherboard or something else I'm missing?

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