LG INDIA/ LCD TV LH20 WITH RGB SLOT
NOT GETTING CONNECTED TO PC

I have purchased the above product on the assurance that it works as TV and also as PC Monitor. It has one RGB slot. I connected the TV to the PC with on D 15 pin cable. but it is saying no format. the local service centre mechanic could not identify the problem. I have not received any cable for connecting the TV to PC. I used the one I was using for connecting LCD monitor. I feel cheated by their advertisemnt, product palmlet, instruction manual etc which clearing shows that the same can be connected to the PC easily. Please help