I can tel u to change BIOS settings
but u sed u r beginner
so let the engineer do the job

U may mess thing up and end up wid another faulty part

But if ur sure then the followin is the way
restart computer and press "delete" key if u hav
PC around 3-4 years old
if very old PC then press"F8"

keep presing and a blue screen will come
then there willb "general settings"
or jus go through all menus and search for
"BIOS CACHEBLE"
if it is set as yes then use"+" or "-" keys to change the
valkue to "No"

press "F10"
or read the bottom of screen to know the key to
save the settings

then restart
if this is successful then it was the problem
But I strongly doubt on RAM