hp 6730S strange problem

Hi i have a big
Problem with the Compaq 6730s PC Notebook
hi i have a big strange problem with a laptop of a customer it's an hp 6730S it hangs at the HP logo with the message "press the esc key ....." when i press the esc or any key nothing happen . it hangs there i 'm an electronic engeneer specialised in laptop repair ! so i have programmed the eeprom but the problem is the same . dismounted the laptop ,changed the processor , the memory , changed a new eeprom chip but the problem is the same. so i decided to reboot the laptop , to press the esc key and to wait . after 40 min it goes to the setup . i have tried every thing there but after rebooting the same thing happend and must wait for 40 min again to see it going to setup . i putted a virtual windows on a cd and after 40 min it boots on it and begins to load windows but veryyyyyyyyy veryyyyyyy slowly until it rises the windows desk ... strange problem. can someone help me ?