I've tried all the above for a D630 not turning on,none work but it does come on when it feels like it.I've taken it apart and

[dalemills1944]

The laptop won't come on early or mid morning but around noon it will start waking up.

 

[Laptop_Nerd]

Hi,

Here are some troubleshooting steps that may help.
- Start with a hard reboot, unplug it's AC adapter then press and hold the power button for 20 seconds then try booting it.
- If it doesn't work reseat the RAM, remove them all for couple of second then put them back in making sure everything is seated properly.
- Again if these doesn't work but you can hear the laptop on but with no display, connect an external monitor and see if it would display anything because if it does that means it's the built in display that is faulty.
- Next to try is if your AC adapter is still okay by trying another AC adapter that has the same voltage and see if it would work.
- Do also apply an new thermal paste on both the CPU and GPU of your laptop just in case.

Hopefully these troubleshooting steps will help.

 

[dalemills1944]

Hi,
Did everything you said to do but no change,if it holds to its pattern it will come on around eleven,will keep you posted.
Here are some troubleshooting steps that may help.
- Start with a hard reboot, unplug it's AC adapter then press and hold the power button for 20 seconds then try booting it.
- If it doesn't work reseat the RAM, remove them all for couple of second then put them back in making sure everything is seated properly.
- Again if these doesn't work but you can hear the laptop on but with no display, connect an external monitor and see if it would display anything because if it does that means it's the built in display that is faulty.
- Next to try is if your AC adapter is still okay by trying another AC adapter that has the same voltage and see if it would work.
- Do also apply an new thermal paste on both the CPU and GPU of your laptop just in case.

Hopefully these troubleshooting steps will help.