New GPU installed - PC won't boot.

CreepyGeorge

Commendable
Sep 30, 2016
7
0
1,510
Hey you tech savvy people!

I bought a used Radeon 5850 for my father in law to replace his GTX 250.
I'm unsure of what motherboard model he has - all I know is that it's Gigabyte-Intel.
I've put the 5850 in to replace the 250 and the PC won't even boot to bios. It only gives me a loud BEEEEEP and that's it.

I didn't uninstall the NVIDIA drivers that he had on his HDD, so could this be the problem?
5850 says it requires a minimum of 500W.

His PSU has 550W, however, it doesn't seem to have the 6-pin connectors, instead, the GPU came with two, but they don't go directly to the PSU. Instead I just connected the 6 pin connectors to the flat cables which are used for things like HDD or DVD.

Could it be the cables? They are 6-pin connectors on one end, and flat like those of HDD.
The GPU cables look like this: http://www.cablesdirect.co.uk/write/images/products/RB-527.jpg

Oh yeah, I tested the 5850 in my own PC and it works fine.

Update: I plug the 5850 while unplugging the dvdrom cable cause they share it - it worked.
I plug the dvdrom back in and it stopped, and won't work after unplugging it.
I unplugged the sound card - it worked with the dvdrom unplugged. I plug the dvdrom back in and it doesn't work...
 

Thunderballs

Distinguished
Jan 7, 2014
238
0
18,760
You should be able to find the motherboard model number on the board itself.

If you put the GTX 250 back in does that still work as before ?

If you cant boot to bios (AFAIK) it wont be anything to do with drivers

Those cables are usually ok and I imagine you have tried connecting them to to different PSU cables.


Have you checked your ram is still seated correctly ?




 

CreepyGeorge

Commendable
Sep 30, 2016
7
0
1,510
I don't have his computer with me, I'm gonna go there later on so I wanted to get a few ideas.
As soon as 250 is back in there, everything works just fine.
Ram is seated correctly, 100%.
I'm not sure if I tried different PSU cables but I'm gonna give that a go tonight.
Any more ideas?
Thank you!
 

crispykiller96

Distinguished
Apr 14, 2009
287
0
18,810
put the old card in and uninstall the drivers properly then install the new card be sure its seated correctly and blow for dust and make sure it has the extra power connections connected as long as the new card POSTS it should be fine then proceed to go to AMD's website and install the latest drivers :)

Joe
 

CreepyGeorge

Commendable
Sep 30, 2016
7
0
1,510
Okay fellows, I put the 5850 in. It works! So naturally, I connect the psu back to the DVD-ROM and it doesn't boot anymore. I unplug the dvdrom (it shares the psu cables with the gpu) and it doesn't work anymore. I'm baffled. :(
 

CreepyGeorge

Commendable
Sep 30, 2016
7
0
1,510
Okay, dvdrom unplugged, I disconnected the sound card. It worked. I plugged the dvdrom back in. It stopped. Unplugged dvdrom, doesn't work anymore. What is this treachery?!