|The original power supply may have damaged the motherboard while failing. If so, there's nothing you can do about that.|
There are lots of el-cheapo power supplies out there that are a lot more likely to cause you problems.
What make and model is the replacement power supply ans how much did you pay for it ?
I have a Dell 3000 sitting here that will not boot normally, I can see nothing obviously damaged on the mboard, and nothing I have tried works. It came with a 250 watt PS that has not failed that still works with other computers.
You could try running CHDSK /R C:
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
There may be a poor connection inside your case somewhere.
Unplug the case/power supply, or switch off the AC power to it otherwise.
Power off your monitor.
Open up the case by removing the left side panel as seen when you're looking at the front of the case.
Check all the connections of the wiring to make sure they are all the way onto their pins and into their sockets, especially the main connector from the power supply. The wires close to the mboard going into the main power connector/socket should be more or less perpendicular to the mboard surface rather than at an angle. Make sure all cards in slots are all the way down in their slots.
NOTE that sometimes when a power supply has failed you will see physical damage - unplug all connections,ram modules, and cards in slots one by one and inspect both sides of the connection in good lighting.
A failing power supply can also cause damage that causes capacitors to fail, the same as in this problem:
Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.: