Hello, The flashing battery light appears when the system is connected to power, whether it is mains or battery and the system will not post. I am hoping it is not the motherboard hence I want to check all the other components, including the usb ports.I have already disconnected the hdd and checked the ram.Connected the system to an external vga still no post. It could be the cpu , usb dvd or motherboard. These I need to check but I am unable to access them as there is black plastic sheet riveted in over them. Steven