HD4850, PC wont power when in.

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Blah

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Ive got ATI 4850, with a 480W power supply, suddenly my PC wont power with it in.
When taking out the power cable to the gfx card my PC will power. With it in, it wont. But when its out, the PC will power but I wont get any display on my monitor.
What Im asking is this gfx card issue or power supply issue?
The power supply is brand new as my last one blew recently and was a 350W

THANK YOU
 
I had exactly the same problem with my HD 4770. Tried it on various other PSUs, but same problem. So I don't think it's your power supply.
 
What brand of PSU? The problem is that some PSUs, if they are no name brand PSUs, are advertised as a certain wattage but are really much lower.
 
LOL seems to me as though the 47xx & 48xx series ATI card have some problems....... I'm Glad I don't own one :P
 
Ancalagon said:
What brand of PSU? The problem is that some PSUs, if they are no name brand PSUs, are advertised as a certain wattage but are really much lower.
Click to expand...

I tried mine on an Antec and Cooler Master , both 650w and 600w respectively.
 
From my experiences: yes wattage does count, but the Amps are very important. if you look at your higher quality PSU's you will see that the voltrails each have their own Amp's. For the higher end GPU's you require preferably 30Amps or more if you add the Amps together. If this is to low you could blow the PSU & potentially also harm the GPU. You could get away with 29 Amps. Where do you see this? On the side of the PSU box or even on the side of the PSU itself.......... those numbers we dont normally read.... ;)
 
I am now certain there is nothing wrong with the power supply and almost 90% certain in the GFX card, what I dont understand is why the PC doesnt even power when in.
 
Do you have onboard graphics? Can you try another graphics card?
 
That is what I thought too. One day my PC just won't boot. So I changed the PSU and still nothing. Then after removing just about everything, I discovered that if I take the power from the GFX out the PC would boot, but obviously complain.. Anyhow I sent my card back, but still waiting for the suppliers for an answer.
 
Dont have onboard and no replacement I can try, working on it tho
 
Did the 350w blew with current system? i.e. 4850 working previously in system with 350w?
I had the problem with a 8600gt. One day it just stopped working. After lots of swapping parts and replacing with other borrowed stuff, I narrowed it down to my mobo.
Allthough the mobo worked with a lower power consuming Gfx card (X1600), the gt won't boot in my system anymore.
 
doubt it .. but could be
in my case,, the I got anohter more powerfull GFX running on the same machine same mobo etc, without probs,
 
Blah said:
I am now certain there is nothing wrong with the power supply and almost 90% certain in the GFX card, what I dont understand is why the PC doesnt even power when in.
Click to expand...

The GFX card might be short circuited, and as a protection mechanism the PSU refuses to turn on when the GFX card is connected. Test it on a friends rig...
 
Well Im still waiting on a reply from Prophecy, to get the card swopped out. Anyone know how to speed this up?
 
I had the exact same issue with a previous 4850... You need to bug Prophecy yourself. Call them. That's all i can offer really.
 
I'm currently running a Gigabyte Odin 550w PSU with my ATI 4850 card - previously had an aOpen 450w PSU and the PC wouldn't power on at all, unless the GPU power was unplugged - same as your current issue...

Won't do any harm to swop-out the card though, just in case.
 
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