Why is my laptop not turning on but the indicator lights flash?

I have a Toshiba Satellite L505D, that I’ve owned for almost six years now. The machine works great, and it’s my main workhorse. Earlier this year, it started experiencing trouble booting up.

When I press the power button, the indicator lights for power, battery, and charge are a steady green, however the hard drive light doesn’t even blink. Also the NUM-lock button and the CAPS-lock button flash, but don’t stay on. I can hear the fan spinning, and the drive as well, but the display doesn’t turn on.

I for sure know that it’s not a display issue, because I’ve tried using an external monitor, and that didn’t help. Also on boot, there is a distinct high speed fan and drive spinning sound that doesn’t happen when this issue occurs. The fan and drive appear to be on, but they spin at a much lower speed, so all they emit is a very low tone noise, enough to indicate they’re on.

Usually it will work after a few times of turning it off and on again, or if I press the F2 button repeatedly when booting up. Now, neither of these methods seem to work. I’ve tried powering it up with just the battery, or with the charger only and no battery, and still no dice.

I’ve tried re-seating the RAM sticks, switching their positions, cleaning them out, still no boot. I’ve even removed the drive to see if that was the issue, even plugging the drive into a different machine (which reads the drive with no problem), and again nothing seems to work.

Its been about a week since the last successful boot, and I have clientele work that I need to wrap up on there. Anyways, not sure what else to do, I’ve seen on here about the SHIFT+F8 combination on boot, I’ll try that, and perhaps other methods, but anything anyone can help with is greatly appreciated.

I’ve tried the SHIFT+F8 combination on power up, and that didn’t work either.