Inspiron 620, won't boot with R9 270X installed

Question

I decided to upgrade the graphics on my Inspiron 620 and fitted an MSI Radeon R9 270X and a Be Quiet 650 watt PSU. The card ran ok for 6 months and then failed. It was replaced under warranty, but the PC will not boot with the replacement card installed even though it is exactly the same model. The card has been back to the suppliers who say it runs fine under test with them. I do not have a suitable spare PC to try it on myself. There is no output to the monitor from any of the ports and no sign of life. The card fans spin and its LEDs light up, but that's all. The PC runs ok on the motherboard graphics or with a different card - ATI Radeon HD6450- in the PCI-e slot. I have downloaded the latest BIOS and I have run the ePSA diagnostics- no errors. Mystified and in need of help, please! Henry

speedstep · Answer

That particular PSU is modular so it only has as many as you put on but it comes with 4.

http://www.bequiet.com/en/powersupply/387

HOWEVER the card

http://www.newegg.com/Product/Product.aspx?Item=N82E16814127775

Is quite Long and therefore may not go all the way down into the slot on a 620.

Card Dimensions 8.25" x 4.38" MAX

The Card in the socket does not LAY FLAT AGAINST THE MOTHERBOARD.

Getting the power adapters in after is impossible imho but you can plug them up BEFORE inserting and then carefully put the card in.

8.6 aka 9 inch cards are a VERY TIGHT FIT. 10 inch Cards are IMPOSSIBLE as are 12 inch cards. Your card requires 2X 6 pin power connections.

DELL-Chris M · Answer

Based on your troubleshooting, the motherboard and its video card slot are fine. Looks like that video card requires two power supply leads. How many power supply leads does the 650w power supply have? Have you tested all available on the video card?

aitchgee · Answer

Thanks for your comments and it is indeed a tight fit. But you're overlooking the fact that exactly the same type of card fitted before and ran for 6 months.

aitchgee · Answer

Thanks for this. The card  needs two pci 6 pin connectors, which the psu has. I've measured the voltage on the pins on the input sockets and they have the correct 12v under load. I really don't think it's a power problem. I wonder if there's some basic incompatibility between the mboard bios and the card's vbios. Is that possible?

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