This happened after windows boots 2 times then third time it happened during booting process right after it showed the bios version.
yes i am sure it is correctly seated.
I have 12.3 driver. I didn't download 12.4 because most users are complaining against it at the amd forum
no when i unplug cable from monitor it shows check signal cable as i have a LCD screen
yes the fan spins and it works too..i bought it yesterday
yes, the vga cable is connected to card not the board, if it is connected to board then a blank screen appears
yes it works fine after card removal
the power supply is good.
I have a P5Q Vm motherboard and my hd 5450 model is HD-545X-CD.
P.S. - My motherboard has PCIe 2.0 x16 so I have updated the bios bcoz the card has pcie 2.1 support. The card fits perfectly and I have updated bios. after updating bios i havent restarted the pc.