The Toshiba 'splash screen' displays, followed by a cursor that blinks in the top left of the screen, then it just goes back to a black screen and eventually restarts itself.
In most cases the blinking cursor appears because the notebook cannot find a bootable device or WinOS is damage.
So check if you can install the Win 7 again… if the Win 7 setup would not see the HDD, then this means that your HDD is affected and needs to be replaced.
In my opinion the CMOS battery is not the reason for this issue so try Win 7 installation…