PS2 Slim 70000 Doesnt Power On

I have a ps2 slim 70004.. It has a red light but when i try to switch on it will go blank (not green) and red again. Red > blank > Red.

1. We already remove the (Ground and 3v )ModBo 3.0 and checked if there's a bridge connection.

2. We already check the switch and its working fine with the other ps2 slim.

3. We already check all the fuse and nothing is blown out from PS1-PS17.

4. We use multimeter to check if there is a 8.5 volt coming from the power supply and yes it does.

Anyone has the same prob with me? Thanks in advance