Contribution d'origine par : oldturkey03 ,
@eidhaddad you cannot pinpoint the cause of this since you do not know what has failed. Download the service manual for your computer [https://download.lenovo.com/consumer/mobiles_pub/lenovo_g_z_50_series_hmm.pdf|from here] and start checking things out. Check to make sure that the memory module is properly seated, that your computer gets power on the DC in jack and proceed from there. Take it apart to see if it shows obvious damage.