Elitedesk 705 G2 -Not Booting After BIOS Update

Hi,

        I've an Eliterdesk 705 G2  and it's not booting after a BIOS update. It's giving 2 Long beeps and 2 Short beeps, nothing on the screen, keyboard unresponsive. Took out the battery, jumper and memory but no luck. Any suggestions would be great.

Thanks,

        David.