Our daughter dropped our old Dell Inspiron 1720 that she uses for kids television. After the fall it would not boot and CAPS lock was blinking. Apparently, the RAM had been unseated, so it was an easy fix. The following procedure worked:

• Unplug the AC and battery. Remove both the RAM modules as well.
• Press the power button. This will help to loose all electrical static remains left in it. Hold it for about 10 seconds.
• Then plugin the AC and turn on - it should automatically shut itself off again due to the absence of the RAM modules. However if it doesn’t or if it blinks again then just power it down.
• Remove the AC, then re-install both the RAM modules, then press the power button again for the same 10 seconds to loose all discharge especially from the RAM itself. Then plugin only the AC. Power it. See if it works this time round.