Like you, and I have access to other documents, I do not find anything on your specific error codes. However, I would suspect that ultimately the motherboard is the problem. What did you do prior to this? Update the BIOS? Have a power failure?, etc.
To be blunt, considering the age of the PC and that it is an entry level system, I wouldn't consider repairing it.
Dell forum member since 2002
Dell Inspiron 15 - 5577 Laptop
Home Built Desktop PC with ASUS ROG Z170, i7 6700K CPU
Windows 10 64 bit Pro and Windows 10 Insider Program Beta Versions. SSD drives. Cakewalk by BandLab and Studio One 4.1 Recordng Studio Software.
Dell S2719dgf Monitor
Member of Nashville based R.O.P.E.