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March 14th, 2019 12:00
Tried installing video card, computer won't boot anymore
Recently I bought an Nvidia GeForce GT 710, and tried installing it into one of my computers, a Dell Optiplex 755.
Once slotted, POST failed with 6 long beeps, with a short pause between the 4th and 5th (video card failure?) but diagnostic lights 3 4 (Memory subsystem configuration failure?). Later I found out my PSU is capable of delivering only 18 A on 12V, and my card requires 20.
So I removed the card from the slot, and the same indications continued, even with the PCI-E slot now vacant, and the VGA cable back in the mobo's port.
Then I removed all the RAM modules and started re-installing them one by one. The audible beeps completely stopped, and the diagnostic lights changed to 2 4 (Video subsystem configuration or failure?)
I once again tried installing the card into the PCI-E slot and plugging the VGA cable into it, the diagnostic lights then changed to 1 2 3 (POST complete - On-screen error message?) but only a blinking pointer was displayed on-screen.
Installing a legacy video card into the PCI-E slot results the same as above: no beeps, blinking cursor on-screen not responding to any input, 1 2 3 on the dashboard.
Removing any card from the slot and plugging the cable back into the mobo VGA port results in no beeps, but no video output at all, and 2 4 on the dashboard.
At this point, I cannot get my computer past POST either way, with or without a card, and I have no idea what might have happened or what am I missing.
Thanks for any help in advance.
Tesla1856
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March 14th, 2019 13:00
Sounds like you broke it. :Crying:
Maybe you didn't remember to dissipate the flea-power? Maybe you are not familiar working inside electronics?
Either way, working on computers requires skill. Any time you open a computer to work on it, might be the last time it works. Computer technicians are trained to keep that occurrence at a minimum. :Cool:
bradthetechnut
9 Technologist
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March 15th, 2019 21:00
I checked the GT 710 with the Optiplex 755 in userbenchmark and it's there. The PCI-E x16 slot has a 25 watt limit (as stated by the slot) and the GT 710 is 19w. However, it's not stated the size of your 755 - MT, DT, SFF, or USFF. Only the USFF doesn't have expansion slots. In the specs. for the GT 710, it states a 300w PSU for a minimum requirement. I'm not sure why that is for a 19w card. Even the smaller PSU's should be able to power it.
I can't be for certain from here, but from what I read in your post, it looks like a defective card broke your computer.
You did a good job of troubleshooting though with trying it with and without cards and even re-seating the RAM in case that was it.
Mobius One
1 Rookie
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51 Posts
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March 21st, 2019 16:00
Just leave it unplugged for a while. You probably don't need to reset your BIOS! Unless you were working on carpet without a ground strap I doubt you fried anything.
Tesla1856
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March 21st, 2019 19:00
Sure. But will it work 100% ? not likely.
Sounds like OP blew-up a perfectly good computer. That's how easy it is (and he even seemed to know a bit about it).