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Pc won't turn on after hd 5450 installed

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Last response: in Graphics Cards
December 30, 2011 12:22:57 AM

Motherboard - 915g combo ms-7058 ver 1
hdd - 80gb western digital
ram x2 512mb - ddr1
cpu 2.8 ghz p4 prescott
gpu - xfx hd 4550 / sapphire hd 5450
psu - 550w xfx pro
cooler - coolmaster hyper tx3

I have a problem, after taking out my hd 4550 xfx and installing a hd5450 the pc won't boot.
when i press the power button i hear the psu and fans turn on for a split second and dyes.
and turns on again and dyes again, this repeats forever. no beeping noise.

If i take out the hd5450 and install back my original card hd4550 it boots fine everything works.

It isn't the psu as i ran it through a power tester.
Gave a friend my card to install into his pc and it works not a defective card.

ran every test i can tried a different psu 350w same results.
tests done are psu 550w & 350w just hd5450 , cooler , cpu, hdd. - both same tries to power it. dyes and restarts.
psu 550w & 350w - hd4550 , cooler, cpu , hdd - both boot normally. also cleared cmos same result

Its either motherboard doesn't support the hd5450 or motherboard short circuiting somewhere trying to draw enough power for hd5450. only thing i can think of.

Need some help
thx in advance

More about : turn 5450 installed

a b V Motherboard
December 30, 2011 2:28:05 AM

Try updating all motherboards drivers?
December 30, 2011 9:30:00 PM

Try removing everything from your motherboard except gpu ie drives, usb, etc

Make sure all 24 pins on your psu are connected and the cover on the last 4 pins is removed.

If it still has the same problem then it's unlikely a power issue ( you have more then enough anyway)

Next using older gpu put the bios setting's back to default

If it still has issues updating the bios is the only other thing I can think of. Your motherboard is compatible with that card.

Good Luck
December 30, 2011 9:34:29 PM

I did that.
had mobo gpu hd5450 psu cpu and cooler hdd - the power turned on for a second and cuts then restarts that procedure again.

if i have mobo gpu hd4550 psu cpu and cooler, hdd it boots fine.