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PC Won't Boot When Graphics Card PSU connected! Help!

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September 10, 2011 5:23:16 PM

Hello all.

I've been facing a weird problem, my PC Specs are here:

2B PW233 PSU 500W
Intel Core 2 Duo E7500
GIGABYTE Radeon HD 5770 1GB
Biostar G31 M7 TE

Problem:
Everything was working greatly until I switched on my PC that day, and it wouldn't boot. I thought that my past PSU unit (Digital (R) 450W) was faulty, so I changed it to a newer one (2B PW233 PSU 500W), but that did no good even. When my graphics card is only plugged in the PCIe slot, the computer boots fine and everything works normally, except the display which won't show, because the GPU is disconnected. When I connect the video card with the 6 pin power connector, then push the power button, the PC won't boot at all, and the PC fans rotate a very very very little degree and then stop a.k.a instantly stop, and the green light above the power button flashes green.

\Can somebody shed some light over my situation? I bought this card at a rather high price and I hope it isn't bricked.
a c 1307 U Graphics card
September 10, 2011 7:17:52 PM

Looks like the card is creating a short!
September 10, 2011 9:33:45 PM

rolli59 said:
Looks like the card is creating a short!

Oh thanks for your reply.

A short? Is there some dirty way of overcoming this? The card physically looks perfect. Please advice!
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September 10, 2011 10:26:33 PM

Bump. Please anyone! I'm in a misery!
a b U Graphics card
September 10, 2011 10:48:35 PM

If the 5770 is under warranty then contact Gigabyte. If not start looking for a new card
September 10, 2011 10:51:01 PM

Can you try a different graphics card you know is working fine, to declare if 5770 is the cause of your troubles?
September 10, 2011 11:07:31 PM

Hello ammyt!

Even though you upped the power supply wattage you may still have a problem at the +12v rail with the PSU not supplying enough Amps to the card which is why you got a boot but no display.

Although Gigabyte's website only states that a 450w PSU is required to run the card the +12v still has to be taken into consideration. I recommend a PSU @ 600w with a single (or +12v-1 & +12v-2) +12v Rail rated at approximately 45A single or in total, this PSU (OCZ OCZ600MXSP ModXStream Pro.) would run your card, mobo & cpu.

ammyt said:
Hello all.

I've been facing a weird problem, my PC Specs are here:

2B PW233 PSU 500W
Intel Core 2 Duo E7500
GIGABYTE Radeon HD 5770 1GB
Biostar G31 M7 TE

Problem:
Everything was working greatly until I switched on my PC that day, and it wouldn't boot. I thought that my past PSU unit (Digital (R) 450W) was faulty, so I changed it to a newer one (2B PW233 PSU 500W), but that did no good even. When my graphics card is only plugged in the PCIe slot, the computer boots fine and everything works normally, except the display which won't show, because the GPU is disconnected. When I connect the video card with the 6 pin power connector, then push the power button, the PC won't boot at all, and the PC fans rotate a very very very little degree and then stop a.k.a instantly stop, and the green light above the power button flashes green.

\Can somebody shed some light over my situation? I bought this card at a rather high price and I hope it isn't bricked.

a c 1307 U Graphics card
September 11, 2011 4:37:02 AM

Can you provide us with a link to your PSU? (Some 500watt PSU's can not deliver)
September 11, 2011 11:35:41 AM

techseven said:
Can you try a different graphics card you know is working fine, to declare if 5770 is the cause of your troubles?

I plugged in my old HD 3450, it doesn't require any additional power supply, just plug in the PCIe slot and the PC booted fine.
September 11, 2011 12:14:55 PM

foundationer said:
Hello ammyt!

Even though you upped the power supply wattage you may still have a problem at the +12v rail with the PSU not supplying enough Amps to the card which is why you got a boot but no display.

Although Gigabyte's website only states that a 450w PSU is required to run the card the +12v still has to be taken into consideration. I recommend a PSU @ 600w with a single (or +12v-1 & +12v-2) +12v Rail rated at approximately 45A single or in total, this PSU (OCZ OCZ600MXSP ModXStream Pro.) would run your card, mobo & cpu.

Thanks a lot for your valuable reply.
I've managed to get a photo of my PSU's specs:

Any ideas?
September 11, 2011 12:52:31 PM

Gfx is fine but psu is in the low end - if there was a short the psu have shut down - but your psu is simply not strong enough - you might need to invest more money in a higher quality psu
a c 1307 U Graphics card
September 11, 2011 1:01:09 PM

That PSU is right on the limit of driving the card if it can deliver its advertised rating (not always the case). A real 500watt PSU should have minimum 30+ amps on the +12 volt rail.
September 11, 2011 1:21:14 PM

Thanks a lot. I just need to make sure my card isn't bricked.
BUT I used to use this PSU before, and everything was working wonderfully :(  This one even seems to have lower specs than my new one! Any comments?
September 11, 2011 3:11:28 PM

Note that the problem happened at a sudden using my old 450W 18A PSU, but before that, everything was working properly. If that PSU was able to run the card, why can't my new one do?
September 11, 2011 3:54:51 PM

Also note that both of your psu's only have one 12v rail whereas the newer ones have at least two. Try getting a 80 plus psu as most that are certified as 80 plus are decent enough to use, personally I like Antec's earthwatt psu's as they are relatively cheap and made pretty well. They also have a three year warranty which is cool.
a b U Graphics card
September 11, 2011 3:59:16 PM

Single Rail PSU's > Multi Rail PSU's IMHO.

Also to all the people saying you need a PSU with 40A on the +12V are wrong, just get youself a Corsair CX 430 V2, XFX Core Edition 450W PSU, or a Antec Earthwatts EA450D.

I'm running my setup, which is much more power hungry than yours, with a HD 6870 and a Phenom II 555 @ 4Ghz, on the XFX Cre Edition 450W PSU, and it only draws around 333 watts from the wall.
September 11, 2011 4:37:02 PM

Thanks.
My point is, if my old weaker PSU was able to run the card, why can't the new one do so? The problem occurred with my old PSU, so I thought the PSU was bricked, but now even the new PSU cannot boot with the card, so I guess the card's bricked. Right?

Best solution

a c 1307 U Graphics card
September 11, 2011 5:12:41 PM
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It is possible that the card is bricked, caused by your older PSU if everything was working fine before. Then again there is no guarantee that the new PSU can deliver its rated power.
September 11, 2011 5:56:25 PM

Best answer selected by ammyt.
September 11, 2011 5:57:55 PM

Ok I think that settles it.
My last chance would be to try my card in another PC, and report. Many warm thanks to everyone who contributed.
!