The Toshiba Satellite L300 was a notebook designed and sold by Toshiba that came with a version of Windows Vista force fed. They were sold around May-June 2009 and while ineligible for the free 7 upgrade,time past and upgrades are unclaimable now,run 7 home premium well without upgrades mainly because of Vista's resource hog quality

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blacksreen,with fan on and led lights on whats wrong

my laptop wont boot up when booted only the fan runs and the leds lights go on nothing elses

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@smindlos before you replace anything you want to ensure that it is your screen that has failed. Attach an external monitor and see what it displays. This series of Toshiba had plenty of other issues that could be causing it.

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Sounds like the screen has failed.

Fixing the screen yourself is not too expensive but if you take it to get repaired by a repair centre the cost may vary.

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i have done that already still no response i have opened the motherboard and there is a hissing sound on it when i switch it on with out the PSU but when i put the PSU in it stops

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Could be an earthing issue with the board

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how do i fix that if thats the case

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You may want to try a static discharge . Try removing the battery and the power supply . Once there is no power available to the machine hold down the power button for 60 seconds. this drains any residual power from the board and allows the machine to boot normally . If this brings no joy try removing one stick of ram from the machine and try booting then switch to the other stick . often when one stick of ram goes bad you get the conditions you describe. if none of this helps then you need to start looking at the display or the video controller

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