Please
follow the diagnosis outlined in this article to check whether the
backlight lamp or the inverter board are the root cause of the problem
or not:
http://www.fixya.com/support/r6430776-troubleshooting_laptop_power_failures
If
you connect the external monitor & nothing is displayed on it, then
this means that both the backlight lamp & the inverter board are
fine. The main indicators in these cases are the sound, and the hard
drive LED on the laptop case. If the laptop sounds just like it always
does for a minute or two after being turned on, it means it's going
ahead and booting the operating system, but the video processor or part
of the motherboard circuit for video output has failed. If the laptop
just sits there and beeps when you turn it on, or if you hear the fan
but not the hard drive chuckling with its active LED flashing away, it
means the laptop isn't getting as far as trying to boot the operating
system. While this could be due to any number of hardware problems, the
most common and easiest to
troubleshoot or repair is RAM failure. If
your laptop has two RAM modules installed, try booting with just one
and then the other in the primary slot. If your laptop only has one RAM
module, you might consider buying one online from a site with a good
memory selector, like Crucial.com.
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I swapped the RAM and that allowed ythe screen to come on. but now the screen comes on a cursor apears in the top left then the laptop squeeks and turns off and starts over again following the same process.
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