No response to comands

Hello,
i have a big problem here....few days ago i tried to install imac os x and windows in one computer....i partitiated hd and done most of the job well...later i installed acronis os selector in order to be able to switch from windows to imac and return to windows later....the problem is when i turn on computer there is no pointer so i cant chose the operating system to use and the keyboard doesnt response too....can i connect it to another computer via lan cable or somehow in order to fix this problem???

sorry for bad english....i hope you can help me....thanks a lot