Just went through something like that. Got a Karcher (sp?) and I even stopped at a small engine place to have it looked at, they suggested I go to a specialist. Oh boy, mine is a 2400psi from Menards, not a high end unit, didn't know if I wanted that much invested....
So I typed in the brand & model number in Google, and there were several hits that described my problem to a T.
One even had drawings to show how to fix it. Basically the pressure release valve gets gunked up with calcium/iron and doesn't slide. Take it apart & put grease on it and works great. Took me longer to read on the internet than to actually do it.
Mine would flow water through it, but would not build up hi pressure - I'd have to take the nozzle off and flow water, put nossle back on, and _then_ it would work - one time. any time I stopped the water flow, would have to remove nozzle, let water flow, and then it would go.
I think your problem can be related to that valve, but I won't say for sure - could be sticking in the other position and not letting anything happen.
Or perhaps your trigger valve is messed up similar, have you tried it without the trigger attached at all? You can replace them pretty cheap. (Edit: Kinda sounds like this, re-reading your message.....)
But type in the brand & model # to google, and 'no flow' or some such, and I bet you will get help on your exact problem.
I understand if you take the wrong part apart you have a mess and maybe lose a lot of high-dollar oil; so I'd want to follow some instructions that pertain to your model.
My deal was very very easy, pull off a cap, take 2 toex screws out, pull a plastic housing off, pressure up with water, find the valve that flew out, lube it with grease, and put back together. A caveman could do it. Just needed to know what pieces to take apart.
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