You don’t say which motherboard you have. That helps the helpers. Which model, are you using a built-in Ethernet or one from an add-in card? It may just be that the driver is incorrectly installed - often the case on this forum. Go to the Control Panel and click on “Device Manager” and then look for “Network adapters”, click on it. You are looking for the one that does not say ”WAN Miniport”. It may have an exclamation mark (!) on it. Alternatively you may see something under “Other Device” with the exclamation mark. Which ever unistall it and reboot your computer. Go back and look in the “Device Manager”. What do you see?
Turn off laptop, if not ready off, unplug the charger and take the battery out. Hold down the power button for 30 seconds. Now just plug in the charger and turn on. Does it start up? Yes then battery is probably dead or defective.
First, blow out dust through the side vent with canned air - with the computer turned off and battery removed, of course. See how termperature is. Second, replace hard drive with an SSD regardless. Then see how the temperature is. It is doubtful you would need a new laptop. With respect to judah, re-doing the thermal paste is probably not needed and really, I would say, only a job for techies. I’ve read too many cases of people having serious trouble after attemting this. I would go step by step checking temperature after each one
First Step: Unplug the charger and take the battery out. Press and hold the power for about 10 seconds. Do not install battery. Plug in the charger and press the power button. Does anything happen? Lights, fan, screen, etc. Oh and never, ever clean ANYTHING in a computer or any electronics with water!!!! Second Step: We will seee.
As with all driver problems it must first be COMPLETELY uninstalled. Not just the standard “uninstall”. Use one of the very good freeware uninstallers that scour the registry, etc., as well. Reboot and then re-install. Let me know how it goes. If it doesn’t work probably a hardware issue.
Assuming there is no hardware damage try this: (1) Power off the laptop. (2) Take the battery out. If the battery is integrated and does not have a latch to release it then leave the battery inside the laptop. (3) Disconnected AC adapter from the laptop. (4) Press and hold the power button for at least 15 seconds. (5) Reconnect the battery and plug the AC adapter. (6) Power ON the laptop.
I just read the manual and it does explain what red LED and 5 beeps is. “Pre-video memory error.” It goes on to say: (1) Reseat the DIMM’s (2) Replace one at a time to isolate faulty module (3) Replace third-party memory with HP (though just make sure they are DDR3L-1600 or 1866 1.35v, etc.) ( https://www.crucial.com/ScanListView?mod...-upgrade-for&urlRequestType=Base&catalogId=10151&...-1&manuFacturer=HP-Compaq&langId=-1&storeId=10151&modelCatId=1301050) (1) Replace system board If the RAM are, in fact, the correct ones and seated properly then it may be the system board.
If you will be working with a wide variety of equipment get both. Imperial is common in North America amd metric pretty well the rest of the world though because of the size of the American market you will find Imperial outside that region.