GPU Running but no display

[TEEMO3]

I have a...
Lenovo Desktop Computer H50 (90BG003LUS) A8-Series APU A8-7600 (3.10 GHz) 8 GB DDR3 1 TB HDD AMD Radeon R7 Windows 10 Home 64-Bit

10 Compute Cores 4C+6G

https://www.newegg.com/Product/Product.aspx?item=N82E16883798516

I recently bought a NVIDIA Geforce GTX 750 TI from ebay

http://www.ebay.com/itm/New-NVIDIA-...389255?hash=item2cb78330c7:g:5NEAAOSwa~BYV5e0

The card runs just fine, I have enough Watts to supply the card, and it seems to run just fine. PC boots but there is no display.

Have tried
-Using VGA and and HDMI ports as well as different monitors.
-Switched Video output on bios, switched on board to GPU.
-Uninstalled old drivers before then plugging it in again.
-Switched power supply, 400W is the minimum to run a GTX 750 TI.

HDMI and VGA cables were both plugged from the monitor into the GPU port but no display screen. No beeps or anything, but the GTX is running. I did plug the 6 pin cable from the GPU into my 400W power supply. It is simply because my motherboard or PC model is too old, or is it because my motherboard isnt compatible with the GTX 750. I do not know what type of motherboard I have, only that it is a Lenovo H50 PC. Is the card itself broken? Power supply was recently bought. Or is the card not compatible at all with the Lenovo H50. Sorry if I seemed clueless about this, but I am a complete noob when it comes to PC'S and GPU'S.

 

[Elixer]

The card runs just fine, I have enough Watts to supply the card, and it seems to run just fine. PC boots but there is no display.

Have tried
-Using VGA and and HDMI ports as well as different monitors.
-Switched Video output on bios, switched on board to GPU.
-Uninstalled old drivers before then plugging it in again.
-Switched power supply, 400W is the minimum to run a GTX 750 TI.

HDMI and VGA cables were both plugged from the monitor into the GPU port but no display screen. No beeps or anything, but the GTX is running. I did plug the 6 pin cable from the GPU into my 400W power supply. It is simply because my motherboard or PC model is too old, or is it because my motherboard isnt compatible with the GTX 750. I do not know what type of motherboard I have, only that it is a Lenovo H50 PC. Is the card itself broken? Power supply was recently bought. Or is the card not compatible at all with the Lenovo H50. Sorry if I seemed clueless about this, but I am a complete noob when it comes to PC'S and GPU'S.

Obviously, the card is NOT 'running just fine'. Just because the fans spins, means nothing.
if the BIOS was set to use the PCIe card instead of integrated, and you don't see a display at all, not even at POST, then, you got a dud of a card.