This is HP Pavilion S5228HK S5200Z CTO HP-G251GF3 250 Watt Power Supply-MISC-HPG251GF3

Model #: HP-G251GF3 REV:01
TATUNG P/N: 5775104022
Manufacturer: HP
Brand: Hipro 
Part #: MISC-HPG251GF3
Compatible Model: HP Pavilion S5228HK, S5200Z
Output Power: 250 Watt
AC Input: (50-60Hz) 100-127V-/8A
DC Output: +5V-/18A, +12V-/5A, +3.3V-/16A, +12V-/13A, -12V-/0.3A, +5VSB-/2A

Connectors :
1 x Main connector (24 pin)
1 x 12V (P4)
1 x 4 Pin Molex connector
1 x SATA connector
1 x P6 4 pin connector
1 x P5 7 pin connector

Dimensions: 3.6/16 W x 2.5 H x 6.14/16 D - Inches