Help Phone not turning on after firmware update


New to these forums and have searched fruitlessly for a solution to my problem. I have a Samsung Galaxy S. Was updating firmware for the phone through Kies when a message came up on the computer saying that the connection had been lost. I was given specific instructions about disconnecting the phone, taking the battery out and turning the phone back on which I followed to the tee but am now left with a phone that has the dreaded mobile phone dot dot warning sign dot dot computer symbol on it. I cannot do a hard reset using either home + volume up + power or home + volume down + power. I have read a few threads with this specific problem but no solution ever given and these threads were close to a year ago so I have started this new one in the hope that I can fix this myself and not have to take my phone to the shop! Any help out there? Cheers Jen