Hi, Today I have assembled my first homebuilt computer. After installing the PSU, Motherboard, CPU, RAM, and Graphics card, and connecting it to a monitor, the computer fails to show any information. It does beep once, but then it shows a black screen with a flashing underscore in the top left corner. The components used: Corsair CX400W | CMPSU-400CXEU Kingston ValueRAM KVR1333D3N9K2/4G | KVR1333D3N9K2/4G AMD Athlon II X4 630 | ADX630WFGIBOX Sapphire Vapor-X HD5750 1GB GDDR5 PCIE | 11164-04-20R MSI 770-G45 | 7599-030R I have tested it with a single stick of RAM (2GB). Any help would be greatly appreciated.