Lag response from laptop
Hello good citizens of planet earth,
It appears my laptop is ill and is in need of help. There seems to be a problem with the response on my laptop as the title implies. To go further in depth, at times whenever I move my trackpad and move the cursor, it would move to the designated area after a second or two. I was under the impression that this is solely a trackpad issue, but this issue would also appear when I would use an external mouse inserted inside the USB port. Additionally, this issue would also arise when I decide to darken/brighten my screen (F1, F2). Lastly, and simultaneously all together, this lag would also initiate when I would type, and all the words would appear seconds later.
Aside from the lag, and this is just recent, whenever I tried opening up Facetime or Photobooth, my camera would fail to launch, as the green color on top of the macbook screen would initiate on/off. I tried resetting SMC, but unfortunately it hasn't solved anything.
The solutions I've tried to make is taking this to a 3rd party store to see what the issue is, and also, using an online service of troubleshooting this. Both confirmed to me that this is definitely a hardware issue, and not a software issue. Both have used all software diagnostics, and unfortunately nothing came up. Although, this weird issue came up as we tried reinstalling MacOS is that, my laptop wanted to downgrade from MacOS Sierra to Maverick. The 3rd party store suggested it is most likely an upper-case assembly issue, but I should have it send to an apple store as he doesn't have that in stock. The online service too suggested I should take it to an apple store. The problem is, I live in a college town and the nearest apple store is several hours away.
After calling ifixit, I was recommended by this awesome gentleman to make a post prior to ordering anything. He also suggested it might be an uppercase issue, but logic board, battery may be an issue as well.
My gratitude will forever be in your debt if you guys would care to help.
Thank you so much for your time.
(p.s: I should note, that after shutting down the computer while pressing D, my laptop informed me that no issue arises but the battery. Something to do with not being as optimal as it first was bought)