Apple ping.
6 year old computer. Yes. Especially a Mac as they tend to outlive themselves.
Find a Mac forum and ask around.
You’ll have to reinstall the OS.
I bet you didnt update software when available
Any stoppage during startup is an indication of either a BIOS process failing or a communication error that cannot be resolved. BIOS startups are notorious for lacking in failover procedures. If you are able to boot from removable media (CD/DVD or flash drive) that would be my first go-to. After that, attempt to restore to a previous safe startup. If those fail, flashing the BIOS and/or reinstalling the iOS.
More RAM is not the correct diagnosis. You may have “failing” RAM, but certainly don’t need more.
Do an SMC and PRAM reset first - just google that.
If that fails to get you working the above poster is correct you will need to reload the operating system.
Speaking of computer problems - this time, Windows.
I have Win 7, and I hate...hate...HATE...the “LIBRARY” system. I can’t find $h/+ without extensive searching.
I seem to see the same folders/files in several locations.
What happened to the good ol’ “Folders and Files” system...I like it MUCH better.
I’d try partitioning the hard drive before doing anything else.
Here is a pretty good encapsulation of various solutions you can try when your Mac is stuck on startup. The steps are organized from simpler to the more heavy-duty.
http://girlsinthegigcity.com/2015/01/19/yosemite-progress-bar-is-stuck/
Buy a new laptop.
What OS do you have on your iMac?
bookmark.
My iMac is ~9 or 10 years old. I fear I will need to get the answer to this eventually myself.
The problem may be in the user account....
If you reinstall the OS, but not as a clean install, it wont update, or replace the User account.
Also...
Have you tried booting while holding ‘shift’