My computer does not detect my asus gtx 660 graphics card. HELP!!!!

allenthenoob · Nov 7, 2015

I recently got a asus gtx 660 graphics card. now i got it from a friend so i dnot have an a installation disk. i plugged it into my computer hoping it would boot up from the card so i can download the drivers. sadly it isnt being detected by my computer at all. not the bios or anything. ive done so much research on what the problem is and no anser could help. please someone help me.

here is some system info:
OS Name Microsoft Windows 10 Pro
Version 10.0.10240 Build 10240
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name ALLENSTAR-PC
System Manufacturer Hewlett-Packard
System Model HP Compaq dc7900 Convertible Minitower
System Type x64-based PC
System SKU KP719AV
Processor Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz, 3000 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Hewlett-Packard 786G1 v01.16, 3/5/2009
SMBIOS Version 2.5
Embedded Controller Version 255.255
BIOS Mode Legacy
BaseBoard Manufacturer Hewlett-Packard
BaseBoard Model Not Available
BaseBoard Name Base Board
Platform Role Desktop
Secure Boot State Unsupported
PCR7 Configuration Binding Not Possible
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "10.0.10240.16392"
User Name allenstar-PC\allenstar
Time Zone Pacific Standard Time
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 3.71 GB
Available Physical Memory 1.77 GB
Total Virtual Memory 7.46 GB
Available Virtual Memory 5.17 GB
Page File Space 3.75 GB
Page File C:\pagefile.sys
Hyper-V - VM Monitor Mode Extensions Yes
Hyper-V - Second Level Address Translation Extensions No
Hyper-V - Virtualization Enabled in Firmware No
Hyper-V - Data Execution Protection Yes

renz496 · Nov 7, 2015

Have you properly plug in the 6pin power connector needed by the card? In BIOS try to set you primary video output to PCIE instead of integrated.

allenthenoob · Nov 8, 2015

renz496 :

yes i did. and my bios doesnt let me do that. i havent updated the bios in a while but i dont know how to do so. could that be the problem?

renz496 · Nov 8, 2015

Even for one specific mobo there is a few way mobo BIOS can be flashed. If you still have manual intructions for your mobo theen try look around. They usually have instruction on how to properly flash the BIOS with a new one. But before that try resetting your BIOS first.

Anyway please give your system full spec.

allenthenoob · Nov 8, 2015

renz496 :

sadly i dont know how to reset my bios. and for full system specs how would i find that. sorry im really new at this

renz496 · Nov 8, 2015

The easiest way to reset your BIOS setting is by removing the BIOS battery. Did you still have your motherboard manual? If so you can try looking around on how to load default setting from BIOS.

As for the spec i need to know your PSU information at the very least. You should be able to fine the information on the sticker they put on that unit.

allenthenoob · Nov 8, 2015

renz496 :

oh ok the cmos battery thing? and the power supply is a hercules 600w and i think i should mention that this computer was a pre built hp computer. all i have done is change the power supply and the graphics card. im trying to switch from my gt 620 to the gtx 660

renz496 · Nov 9, 2015

Your PSU did it look like this?:
http://m.ebay.com/itm/231659864282

How much amperage did it have on 12v rail?

allenthenoob · Nov 9, 2015

renz496 :

yes thats it exactly. and it says 24A

renz496 · Nov 9, 2015

Ok then when you plug in 660 inside can the pc be turn on or not? Or it did turn on but it cannot detect the gpu? Means the gpu is apinning at all but there is no signal when the gpu connected to monitor. But when connected to video output from motherboard the monitor works fine?

allenthenoob · Nov 9, 2015

renz496 :

yes when its pugged in and spinning the computer boots up fine. but there is no signal coming out the gpu. when i plug it into the motherboard the signal is perfect.

renz496 · Nov 9, 2015

Honestly i was thinking it could be power supply issue. But try resetting your BIOS first. Seems like primary monitor still set to use integrated graphic instead of your 660. Btw in device manager did the OS somehow able to detect the card's presence?

allenthenoob · Nov 9, 2015

renz496 :

to reset the bios i take out the battery in the motherboard right? and yes see thats the main problem, device manager doesnt pick it up either, if it did this would be simpler but like the card is not read at all. the port works for sure cuz i still use my ld graphics card as a test and it runs fine. this one doesnt get picked up at all.

renz496 · Nov 9, 2015

Would be better if you have other PC to test the card. It could be the power supply cannot provide enough power to the card causing the system failed to detect the card. For the 6pin power connector did you connect using one that coming directly from the power supply or did you use molex (like using 2 4 pin Peripheral to one 6 pin PCIE)?

allenthenoob · Nov 9, 2015

renz496 :

i used a molex. and i wish i could test it but i dont have a computer to test it on

renz496 · Nov 10, 2015

If you coulr test the card on other pc and it work then it might be your power supply. For much decent power supply even 400-450 have at least have one PCIE 6 pin with them. But yours there were none means it could be generic unit and not meant to power graphic card that needs a lot more power. Your 600w unit most likely not be able to power something than 750ti at best. If you're lucky maybe something like 950 (which rated at 90w). Maybe you can ask your friend (that give you that 660) which power supply you can get to power that 660 properly.

schaft · Nov 10, 2015

allen, sorry to cut in. Are you sure you have connected the 6 pin gpu power cable? Because i doubt that you did
Why? its because your pc is HP Compaq dc7900 Convertible Minitower. I read the manual http://www.hp.com/ctg/Manual/c01549447.pdf and it only has 135W pure power supply.
The 660 need at least 450W power supply and they do need extra 6 pin cable from the power supply attached directly to the gpu. I can be sure HP will never provide the extra 6 pin because the pc were not intended to be upgraded into gaming station. They always do this on branded pc such as Dell, HP and etc. Home and office model were restricted in power supply and even the space.

Please pick as best answer if this help

renz496 · Nov 10, 2015

He/she already mention that the power supply was once replace with 600w unit. But i think it was a generic one.

allenthenoob · Nov 10, 2015

schaft :

allen, sorry to cut in. Are you sure you have connected the 6 pin gpu power cable? Because i doubt that you did
Why? its because your pc is HP Compaq dc7900 Convertible Minitower. I read the manual http://www.hp.com/ctg/Manual/c01549447.pdf and it only has 135W pure power supply.
The 660 need at least 450W power supply and they do need extra 6 pin cable from the power supply attached directly to the gpu. I can be sure HP will never provide the extra 6 pin because the pc were not intended to be upgraded into gaming station. They always do this on branded pc such as Dell, HP and etc. Home and office model were restricted in power supply and even the space.

Please pick as best answer if this help

i replaced the power supply with a 600w.

allenthenoob · Nov 10, 2015

renz496 :

i guess it was a generic one. but i dont know if i can get a different one right now.

renz496 · Nov 10, 2015

If you can get decent 450w unit that should be enough for 660.

schaft · Nov 10, 2015

600w generic is much like 300W pure. I think that is the main problem. Is it possible that your friend gave you a broken 660?

allenthenoob · Nov 11, 2015

i really wanna try it in a different computer to make sure that its not broken. would suck if it was

Alex192 · Nov 11, 2015

Uh maybe this is stupid but have you plugged you monitor into a display port on the card

allenthenoob · Nov 11, 2015

yes lol i have triple checked all connections

My computer does not detect my asus gtx 660 graphics card. HELP!!!!

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