Need unlocked bios for Lenovo M58p

Hi , can someone help me ?
I've LENOVO THINKCENTRE M58p (7484-A3G) Quad Core Q9400.
And didn't recognize any video card in PCI-e ... .
I've try with ATI Sapphire HD 6670 and Nvidia quadro FX 580 ... (both low profile)
And also have changed the Stock PSU with 400 W Cooler Master ....
Also have flash the latest bios from Lenovo official site and nothing ....
Can some one help with this ??
Thanks