My daughter’s 2 year old Toshiba satellite L305D with Vista home premium was ran without anti-virus software. After being infected, she got black screen and no os boot. After attempting to start it many times, the Toshiba screen came on and Windows booted. I removed viruses, bots, malware. The windows OS became unstable from corrupted files. After powering down, I get a black screen only. On start up, the CD/DVD drive led flashes, the fan runs quietly, the flash drive led flashes, (if installed) but nothing else happens. Starting it with the dealer supplied recovery disk in the disk drive doesn’t work whether I push f12, f8, f2, esc, or 0. I replaced the HDD with another that is good, same symptoms. I don’t have a retail copy of windows vista, will recovery media purchased from Toshiba fix it, or do I have to buy a copy of Windows in order to do a clean install? Did I miss a step and something else will fix it?