4870 trouble (Black screen, crazy RPM)

In desperate need of help here. My newly built computer was working fine yesturday, I went on today and checked the temps of the card and was supprised at the high temps I was getting, so I decided to up the fan speed to 41%. About 10 minutes after I did this I lost signal and the fan started making an extremely loud noise (sounded like a plane taking off) Now whenever I turn on my PC all I get it is a black screen and this very loud fan noise as a greeting.

I have tried switching monitors but that does not seem to do anything, probably something wrong with the card but I'm not sure.

Any help would be greatly appreciated.

Thanks.

Its bad return it.

warrenty time

huarui is right i think......the 4870s make some major noise when the system is first turned on....before the bios gets them under control....

I dont know if you flashed your bios....but it sounds like its not working properly.

Well I installed a 8600GT, booted and left the PC uninstalling the drivers, I come back and BAM, black screen.

So dunno WTF is going on. Mobo is to blame?

What is your PSU?

i presume you plugged in the extra power to the cards? , 520w should be enough if its a corsair , btw dont install a new card until you remove the drivers first if you can help it. id lean towards it being the motherboard also , what motherboard and chipset you using?

PSU should be fine, that 500w is the total system draw, so unless you have masses of hdd then you will be ok. Im afraid your problem is more serious.

Maybe try the card in another pc, but it sounds like the card might be a dud.

may be screen saver?????

i have a similar if not the same problem.

a few weeks after i had put my new computer together my grapichcard started crashing every now and then. after some forum-tracking the best solution i could find was that the swapping between 500 and 750mhz clock speed wasnt working propperly. and this cused the crashes during alternating loads in games.

yesterday i flashed the bios, just changed the 500mhz idel to a constant 750mhz and lowered the minimum temp treshold. That night i turned off my computer properly like always and when i turned it on the next day i was met with a black screen. Does this seam like a bios failure? after flashin the bios i obviosly restared the computer and then it worked just fine for several hours. why wait till the next afternoon to go A wall?

should i send it in or could i easelier fix this myself. (don't have another PCI card to use for flashing with the old bios atm.
But in such an atempt would it work to use another PCI-express card? or do u need to use another port cus u have to disable the one ur flashing is on.... just thinkin out load at the end here...

any help is appreciated