DafyddEdwards

I recently bought a secondhand Inno3D GF-GTX260 DUAL-DVI-HDTV-GDDR3-896MB graphics card from a pc shop, i installed it myself and it dont seem to work i upgraded my power supply to a 700W to make shure i can cover it but i cant get no picture. I insert both 6pin power supply to the graphics card and slot it into the PCI-EXPRESS slot and turn PC on. It boots and i can hear the jingle played at the beginning when the Pc signs in so it is working. can any one say if i broke the card or if it was more than likley broken before i bought it, also due to me trying to install it i have voided my warrenty and now for some reason after taking the graphics card out and re inserting my old one i cannot boot my pc its saying loading operating system boot from cd/dvd bootmgr is missing press ctrl+alt+del to restart if i folo the restart it just dose the same thing, Also i cannot even get the menue to reset my pc to store settings or to before somthing happend. all help needed :) thankyou.