See if you can get some flash drives that you can format.
For Lenovo you should be able to boot to a device clicking the F12 key or Fn + F11 key.
List of PC brands with their corresponding hot-keys
Create a bootable windows 10 iso:
Download Windows 10
For the computer with windows 8 you may need to post that on the windows 8 or windows 7 forum.
For that computer you may want to create a bootable windows 8.1 iso:
Download Windows 8.1
In the above post in one part you typed win 8 and in the other win 7.
In case it is win 7 you may want to create a windows 7 iso:
Download Windows 7 Disc Images (ISO Files)
Create a memtest86+ bootable flash drive for testing memory:
Memtest86+ - Advanced Memory Diagnostic Tool
Run memtest86+ on the laptop for 8 or more passes.
The testing is not by time but by passes.
It will take 8 or more passes to make a valid test.
Tests with less than 8 passes have a significant number of false negatives.
A false negative is a test that passes and there is malfunctioning RAM. The viewer of the pass then thinks the RAM is ok and if the testing was for more passes it would improve the accuracy and display malfunctioning RAM.
So be sure that you run at least 8 passes and the more the better.
The estimated time for testing is 1 - 2 hours per GB RAM. So plan to perform the test overnight.
When the testing is complete use a camera or smart phone camera to make a picture and then post the image into the thread.
Create a bootable USB using Kyhi method:
Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums
On HP computer's when the bios is opened there is firmware or software that can perform diagnostic testing on the computer. It is called UEFI diagnostics. It will check RAM, drive, memory, CPU, MB, graphics, keyboard, audio, etc. What is available on Lenovo computers?
Create a bootable Ubuntu USB flash drive.
Memtest86+ - Advanced Memory Diagnostic Tool.
https://answers.microsoft.com/en-us/...f-ecc7b7ff6461
MemTest86+ - Test RAM Windows 10 BSOD Tutorials