Hi,
Please do try these troubleshooting steps that might help in resolving the issue. (I don't suggest shaking the laptop specially if your using an ordinary HDD not a SSD because that could damage it
).
- Remove the battery and AC adapter then press and hold the power button for 20 seconds.
- Remove all the RAMs and put them back in making sure that they are all seated properly. You should hear a small clicking sound that should tell your if it's seated properly.
- Connect just the AC adapter then power the laptop on. If it boots up normally to the desktop you can connect the AC adapter as well.
- If all these doesn't work and you may need to reseat the CMOS battery as well to reset BIOS to default.