No display input with new gpu

[sorry1516]

I just bought a new gpu and psu, but when I plug the gpu in I get the "no display input" message, the screen stays black and I think the pc keeps on restarting because I can hear the sound it usually makes when it restarts.

I mention the GPU is a Gainward GT 730 and it's a PCI-e x8 and my slot is PCI-e x16. Does this count? Someone told me it's incompatible, 'cause the GPU adapter is too small for the slot and does not fill it...

If I plug in my old gpu (ATI X1550) I get image on my screen...

Configuration:
Sirtec High Power Eco 2 450W PSU
AMD 64 X2 4800+
2 GB DDR2 RAM
Asus M2V-MX SE

What can I do? I'm really desperate here. Should I return the card and get a PCI-e X16?

Thank you!

 

[Computersloeber]

Check if you correctly follow all of these steps:
http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[gakukid991]

i have the same card from gainward and it works perfectly (btw i have the DDR5 version) so check if card is in place in the pci , and the pci is not a prob for the card im running it on a pci x16 even though it is a pci x8 card

 

[sorry1516]

The card is in place. Also the PC makes two beeps when I power it for quite some time. What can I do?
I read it has something to do with the motherboard, or BIOS... do you think resetting the CMOS will help?

 

[gakukid991]

it usualy means rams problems when you get two short beeps (it depends on the mobo) check this out > https://kb.iu.edu/d/afzy / try to remove all ram slots and put only 1 in one slot , then change the slot if the beep is still there

 

[sorry1516]

Did the RAM thing and nothing. Still black screen. When I put my old ATI X1550 the PC has image and the windows boots fine... I'm losing hope on this one. I think I'm gonna return the gpu and buy something else...

 

[gakukid991]

hmm try to install the nvidia driver when your using the ati (dunno if you can do that but it is worth a try )