Not necessarily. You assembled this with someone's help?
Did you guys tried testing it outside the cabinet before assembling everything inside?
Check if the switch on the psu is ON.
Check all the cables are properly plugged in.
- Case cables esp. power line
- CPU fan cable is not installed in system fan pin
- 24 pin, 8 pin CPU, 8/6 pin PCI E
Just install one ram stick, you don't need everything to get into BIOS
No need of drives at this point, remove all
If there is any led strip, case fans etc unplug them.
If this didn't work, get everything outside the cabinet and try with minimal components.