i installed a new graphic card after uninstalling the old one. then when i turn computer on it started then shut down and won't start again after that. the computer starts but the monitor doesn't like turn on. i also notice that the power supply recommend for my graphic card is 250w and i have 230w. is it a power issue? also i removed the card and try to start ma computer without is and it still doesn't work plz help it is not even really my computer