I have "Macbook (13-inch, Mid 2010)" it has white plastic case
with 4GB 1067MHz DDR3 RAM and NVIDIA Geforce 320M 256MB.
Model Identifier: MacBook 7,1
Boot ROM Version: MB71.003F.B00
SMC Version (system): 1.60f6
It had originally El Capitan installed,It booted nicely every time. I think that I didn't go trough all software updates it provided.
I fresh installed high sierra from USB flash drive. I gone trough some installation steps with errors and restarts. Now when I boot, there is cca 50% chance of booting to OS.
Other time i see grey apple logo and progressbar that is filling slowly, gets to 100% and then nothing happens for a whole day. There were some updates of software in between, but they are not related to this booting problem.
Is there any way how to fix this problem?
Edit: three passes of extended apple hardware test passed ok. First aid on HDD passed ok.
Edit2: First aid test from Disk utility passed with no errors, smartctl short and long HDD tests passed with no errors.
Edit3: I tried to reset PRAM and NVRAM, next tried to reset SMC. Didn't help.
Edit4: I did a recent update in High Sierra and update of SMC to the latest version provided for my hardware was triggered. Didn't help.