No it's not normal. Leave the system on for several hours - does it eventually go down?
Will increasing the RAM help - yes, but it's likely not a RAM problem and I don't expect that it'll help much.
Installing new RAM may not affect the warranty - depends on the model (if it has an access panel, it probably won't void the warranty, if it doesn't have an access panel, then it might void the warranty).
Exactly how new is it?
New enough to return for a new one?
New enough to wipe it and start over?
Most places offer free diagnostics on a new PC (either on the system or at a service center).
If it's not hardware, then it must be software.
For a warranty repair, it depends on where you purchased it (they can tell you how to get warranty diagnostics).
In most cases, if sending it out for diagnostics, they'll insist upon you running the Lenovo recovery program (and this will wipe out all your data - so back it up first).
For hardware help, please post over in the Internal Hardware forums: http://www.bleepingcomputer.com/forums/f/7/internal-hardware/
If it's not hardware, then either post in the Am I Infected forums (if you suspect an infection) or in the Windows Crashes, BSOD, and Hangs Help and Support forums.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
)**If you need a more detailed explanation, please ask for it. I have the Knack
. ** If I haven't replied in 48 hours, please send me a message. My eye problems have recently increased and I'm having difficult reading posts. (23 Nov 2017)FYI - I am completely blind in the right eye and ~30% blind in the left eye.
<p>If the eye problems get worse suddenly, I may not be able to respond.If that's the case and help is needed, please PM a staff member for assistance.