XA New For Liteon PS-5221-06 Computer Replace Power Supply 220 Watt Acer eMachines Gateway SFF Connectors:20+4 Pin, 4 Pin 12V, SATA I; The method to turn down the motherboard voltage Firstly, could buy a BIOS which is used to update the motherboard. According to the model of the motherboard, update the oldest version. Please try the versions one by one. And it would be the best to used the version that could change the South Bridge on motherboard. Secondly, according to the voltage of the power supply, judge whether the motherboard should be reduced voltage or boost voltage. Normally, most of them should be reduced voltage. Thirdly, change them one by one, and then restart to check whether it could pass the self-inspection. If it could pass the self-inspection, then save the voltage setting, update the BIOS to the newest version. Compatible Part #'s: PY.22009.002, PY.22009.003, PY.22009.005, PY.22009.006, PY.22009.008, PY.22009.009, PY.22009.011, PY.2200B.001, PY.2200B.002, PY.2200B.003, PY.2200B.004, PY.2200B.006, PY.2200B.008, PY.2200B.009, PY.2200B.011, PY.2200F.004, PY.2200F.006, PS-5221-06, CPB09-D220R, PS-5221-06A2. Max. Output Power:220W; 1.Some computers have case such DELL or ACER. In the case, there is not green led hole, it will be covered. And now we have new version that doesnt have LED light, and this problem will be solved soon. 2.As For the problem that it couldnt open: Firstly, check power supply, dont install the computer, and then connect the 24-Pins black-green line, to check whether the fan could turn or not. If the fan could turn, that the power supply is normal. It proved to be that the power supply and the motherboard is incompatible. In this circumstance, it will need higher power supply to help the computer to be started. After the computer start, turn down the BIOS voltage on the motherboard. After turn down to low voltage, close computer, and connect it to new power supply, then it will be ok.90 Days warranty ships from USA