can anyone recommend me pc build for 400$?

This is pretty much all you can do.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Pentium G4560 3.5GHz Dual-Core Processor ($59.63 @ OutletPC)
Motherboard: Gigabyte GA-B250M-DS3H Micro ATX LGA1151 Motherboard ($69.99 @ Amazon)
Memory: G.Skill Aegis 8GB (1 x 8GB) DDR4-2133 Memory ($52.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($47.69 @ OutletPC)
Video Card: Gigabyte GeForce GTX 1050 2GB OC Video Card ($99.99 @ Amazon)
Case: Zalman T2 Plus MicroATX Mini Tower Case ($25.49 @ SuperBiiz)
Power Supply: SeaSonic S12II 430W 80+ Bronze Certified ATX Power Supply ($44.89 @ Newegg)
Total: $400.67
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-17 19:49 EDT-0400
 
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