Fujitsu Siemens Lifebook E7010.....wont bootup?

Hi all

Ive got a Fujitsu Siemens Lifebook E7010, its about a 3 odd years old, it worked fine until .....

during use it froze........i rebooted it and the following symptoms now occur ..

When the laptop has been off for a while ( few days) upon bootup

...the fan kicks in, laptop tries to bootup, i enter the 4 digit pin, and if all this is done quickly it gets stuck on the "Fujitsu Siemens screen" , sometimes you can still hear the fan working whilst stuck on this screen.

if i try to reboot it at this stage, upon reboot i dont even get the key symbol on the little LCD display to enter my 4 digit pin, when i try to enter the pin i cant hear any bleeps like i would normally, the fan continues to run, the screen is blank and on the LCD display you can see he power supply symbol ( bat or mains) and a circle with a "z" at an angle in it.

Any ideas???

cheers all