I bought a PC around 6 months ago, and it had, as in the title, an ati radeon hd 5450, I used this card for around a month, then one day, when I turned the pc on, nothing came up, so I left it for about 30 mins, still nothing. I looked in the Device Manager, and it wasn't in the PCI slot index. I also looked in the bios, but nothing there. Any ideas?