Computer not starting after installing new GPU

I recently got a new GPU which doesn't appear to be working at all.
System build is:
Gigabyte Z77-DS3H Mobo
8GB ddr3 Ram
intel i5 3570K CPU
Windows 8 32-bit OS
OCZ stealthstream2 700W PSU

I was using a NVIDIA Geforce 9800GT as never got round to upgrading. It has always worked like a dream.
I bought a Gigabyte AMD Radeon HD 7870 - uninstalled all nvidia drivers, deleted the 9800 GT and put in the new card.
The computer doesn't even start up. The fans all kick in(including the GPU fans) but the machine doesn't boot at all. I can't boot in safe mode, I can't get into BIOS options, no start up beeps, nothing.
Any advice would be greatly appreciated.

I am not sure whether its worth noting that my monitor is fairly old.
16 answers Last reply
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  1. Also, it may be worth noting that everything still works fine when I put the old 9800GT back in
  2. I recently got a new GPU which doesn't appear to be working at all.
    System build is:
    Gigabyte Z77-DS3H Mobo
    8GB ddr3 Ram
    intel i5 3570K CPU
    Windows 8 32-bit OS
    OCZ stealthstream2 700W PSU

    Sorry to go off topic , but why are you running a 32bit OS when you have 8 gigs of ram.32 bit OS can only use about 3.5, you are wasting the other 4 gigs of ram.
  3. Wonder if it's the motherboard.

    Try CMOS reset?

    Oh and good point SR.
  4. SR-71 Blackbird said:

    I recently got a new GPU which doesn't appear to be working at all.
    System build is:
    Gigabyte Z77-DS3H Mobo
    8GB ddr3 Ram
    intel i5 3570K CPU
    Windows 8 32-bit OS
    OCZ stealthstream2 700W PSU

    Sorry to go off topic , but why are you running a 32bit OS when you have 8 gigs of ram.32 bit OS can only use about 3.5, you are wasting the other 4 gigs of ram.


    This I was only recently made aware of (bit of a amateur) but I will be fixing this shortly. Could it be to blame for the GPU issue?
  5. Shouldn't be the cause of the GPU issue.
  6. Your components are all good quality.
  7. Is it seated correctly and do you have the power connections all set.
  8. SR-71 Blackbird said:
    Is it seated correctly and do you have the power connections all set.


    Seated correctly in the same PCI slot as my old card and 2 six pin PCI-E connections plugged in. I have tested both connections with the old card to ensure they both work ok
  9. X79 said:
    Wonder if it's the motherboard.

    Try CMOS reset?

    Oh and good point SR.


    I don't have a jumper and don't think I got one with my M/board (or I cant find it). Does removing the battery do the same trick?
  10. SR-71 Blackbird said:


    Thanks mate, that is much appreciated. I will work through that in detail tomorrow. Fingers crossed.
  11. Get back to us on your progress please.
  12. SR-71 Blackbird said:
    Get back to us on your progress please.


    I will. Thanks!
  13. SR-71 Blackbird said:
    Get back to us on your progress please.


    I worked through the list you posted and still nothing. Same result each time. Could it be a dodgy card?
  14. It's possible , i had to RMA one before.
  15. I have the same problem. After replacing my old GT610 inside an HP computer with a new 980Ti ( with some case mods ) (I know that's quite extreme to switch from one of the cheapest cards to one of the most expensive cards ) and got a new 600w PSU. The computer managed to show the BIOS startup screen, jammed there for like half a minute making 3 short beeps with a long pause between them ( beep [ 10 seconds ] beep [ 10 seconds ] beep [ shows a black screen ] ) and then after 1-2 seconds, it said
    "NVIDIA GeForce GTX 980 Ti VGA BIOS
    P14N:98T6G8036D
    Version 84.00.36.00.30
    Copyright (C) 1996-2015 NVIDIA Corp"
    That's it. White words, black background, screen pugged into the GPU with VGA cable and included adapter.
    I touched my CPU heat sink and it is very hot, so I guess it is loading something. I swapped out my GTX980Ti with my old GT610 and it booted just fine. My CPU is and i5-2320, low power consumption, so should not be a power problem.

    Additional info
    Computer - s5-1257 hk
    OS - Windows 7 Home Premium 64bit
    RAM - 2x4GB
    PSU - Corsair CX600
    GPU - Inno3D GTX 980Ti pre overclocked ( HerculeZ X3 )
    CPU - i5-2320 stock speed
    Motherboard - unknown
    Cooling is fine, CPU temperature after 1.5 hours stress test - 65°C

    Please help, thanks.
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