Okay - the dsub analog error pops up whenever the LCD screen doesn't receive a video signal from the motherboard. This is usually because the motherboard is not running properly. Here are some things to try:
a) Reseat the processor. Sometimes this alone will take care of it.
b) Unplug all the connectors to the motherboard and then reconnect them. Perhaps a dirty pin is keeping it from working properly.
c) If you have an Asus motherboard (rather than ECS), then you need a 4-pin 12v connector from the power supply connected before the motherboard will power up. I'm not sure if the new power supply you put in was an exact match or not. Here is the
Ion Technical Service Manual, which shows pics of the different motherboards and all the connectors they need.
d) It's possible you may have a more serious motherboard issue, and may need a new motherboard...