AHolzhausen :
No response when pushing the start button and burned insolation smell in case. I replaced the power supply but now the lights come on as soon as I turn on the switch on the power supply, not the normal case switch, and the just stay on.
To fix it the first time, don't just replace parts on wild speculation. A power supply is only one component of a power system. Power supply controller could be harmed. Or replacing the supply has created another failure. Maybe the original supply was OK and the new supply is defective. Or new power supply is OK but does not work properly in that system. Numerous possibilities. Either keep buying and replacing parts until something works, or get numbers so that the next reply comes from one with better knowledge. Nobody can pinpoint an answer unless you first provide facts (numbers) that make that possible.
In less than a minute, obtain critical voltage numbers. Then a next reply reduces the suspect list massively; even down to only one item. How to do that was summarized in "When your computer dies without warning....." starting 6 Feb 2007 in the newsgroup alt.windows-xp at:
http://tinyurl.com/yvf9vh
Connector chart to locate each color:
http://www.hardwarebook.net/connector/power/atxpower.html
Or just keep buying and swapping those parts until something works.
Best solution is to make no further changes yet; not complicate the problem. First obtain relevant facts - those numbers. Know what is wrong before replacing anything.