Hi,
First, with reference to the Service Manual on the link below - remove and re-seat your memory module(s).
If the above makes no difference try the following.
Again, with reference to the Manual on the link below, remove one of your memory modules and then see if the notebook will boot. If it doesn't, try the same module, but in the other slot. If is still doesn't boot, try the other memory module in both slots, to see if any combination will allow the notebook to start normally.
The procedure for removing these modules is detailed starting on Page 63 of your Maintenance & Service Guide.
Regards,
DP-K
