Laptop incredibly slow and battery won't charge

[Covinad]

This is the computer: https://www.amazon.com/gp/product/B014BGTSDI/ref=oh_aui...

I bought this ~1 year ago.

1 month ago: It was working perfectly. Fast, perfect, whatever.
1 week ago: Internet videos seemed oddly laggy. But whatever.

Yesterday I acquired the following symptoms:

1. Battery won't charge at all. UNLESS the computer is in sleep mode, then it charges fine.
Additionally, I've found that if you plug it in while asleep, then turn it on, it will stay in "plugged in, but not charging," and not drain the battery.

However, if you plug it in while it's active/not in sleep mode, then it just drains the battery as if you didn't plug it in at all.

2. The screen displays an error message upon start up: http://support.hp.com/us-en/document/c01443496

Which is apparently something yo might see "after the system board is replaced." Although no modifications have ever been made to this computer.

3. It's incredibly, incredibly slow. Closing small programs takes several minutes. Hovering over a hyperlink takes 10 seconds for it to register. Videos often won't load. Websites won't load (although I don't get any error messages about internet problems. I don't get that "timed out" thing.)

4. There are Windows updates to apply, but it gets stuck at "Getting ready" and never proceeds.

I would really appreciate any help. I feel completely lost here and I have a big exam of sorts coming up, and I really need my computer to work.

I scanned for problems with Malwarebytes and it didn't find anything.

[visruth]

Hi,


Tap away F2 key as you power on laptop. Do extensive system testing. It'll take few hours. Let it finish.

Do battery test from HP support assistant software.

For the error message, you've to contact HP in your region.


Regards

Visruth

[Covinad]

Can battery failure explain the drop in performance?

[visruth]

Yes it can. But you've to definitely to rule out other hardware failure.

[Covinad]

A family member has the exact same laptop as me, so I replaced my battery with theirs (which works perfectly), and I saw no change with my computer.

Still slow. Still not charging when plugged in. 

With a completely new battery.

[visruth]

Hi,


Could you do extensive system tests from BIOS/UEFI System Diagnostics?

http://support.hp.com/in-en/document/c03467259

Do a hard reset: http://support.hp.com/in-en/document/c01684768

Reload BIOS to default settings: http://support.hp.com/in-en/document/c00034791

Specs: http://support.hp.com/us-en/document/c04753170

Support page: http://support.hp.com/us-en/drivers/selfservice/HP-15-Notebook-PC-series/8502685/model/8788090


Regards

Visruth