If I was you I would take the hard drive out from the back and see if it boots into dos.
To take the hard drive,
On the underneath of the laptop there will be a cover with 2 circle on and a few screws in.
Take the screws out and the hard drive will be under the cover.
The drive will pull out with abit of force, then boot the laptop and if it is ok it will do the POST check.
These pictures may help you click here
Let us know how it goes.