Samsung R540 wont boot up

[tedley]

Hi,
My samsung R540 seems to have shot it. When I boot it up blue samsung screen appears showing F2 and F4 info. Screen then goes black and the process starts all over again. cannot get into safe mode. pressing F4 or F8 has no effect. Anyone got any ideas pleaseas I am about to fetch my hammer out of the garageto see if that sorts it out.
Thanks

 

[aldan]

anything lead up to this problem.did you drop it,bump it,install any software,use a cleaning/optimization tool?

 

[tedley]

anything lead up to this problem.did you drop it,bump it,install any software,use a cleaning/optimization tool?

Hi. Thanks for reply. Did nothing. It was working ok, I switched it off and when I switched it back on there was this problem