Many prebuilt systems use proprietary PSUs. You won’t see a standard wattage label, but you can:
If you cannot open your case, you can often find the wattage through secondary records. how to check pc power supply wattage
Look for a sticker listing technical specs. The wattage is usually displayed prominently (e.g., "750W") or listed next to "Total Wattage". Many prebuilt systems use proprietary PSUs
5/5 stars. Well done!