M9400f wont startup

I have this problem with my computer M9400f. It came with Vista, and I upgraded to Win 7 hoping to solve the problem, but to no avail. I have searched the net and HP support and any other source that remotely suggested a solution.
The problem is if I shut it down, it will not restart for some time. When I shut it down, the green light on the power supply stays on for bit before going out. I turn it back on and the green light comes on, but the power button gets no response and does not light up when you push it. Sometimes I have to turn it off and let it sit a while and then turn it back on and wait for the green light on the power supply and then wait another while and if I am lucky and time it right it will boot up. If not I start all over again. It will restart from the start button for updates, etc. but you cannot shut it down and get it to reboot. I have been through all of the trouble shooters on HP and Ask.com, Fixya.com etc. to no avail. I was going to put in a new power supply, howver the one I oprdered did not fit even tho I ordered it for this computer. One other problem is that when the computer goes into sleep mode or hibernation, the only way to recover is to shut down. I am then back to the same problem as before, I can't boot up. I remedied this by locking out the sleep and hibernate modes in the power management. At this time I am running the computer none stop day and night. However if I have a power blurp I am back at square one.
I posted this on a reply to a post with the same problem, but marked "SOLVED" and I thought maybe the people looking at it thought my problem was solved also, but it has not been solved so I posted it to a new thread in hopes that someone could help me.
Jim
This question was solved.
View Solution.

From the steps taken, it seems to hint that you had the right conclusion in replacing the power supply. I cannot really tell from the product page, but from the case type, it would indicate a standard ATX power supply would be correct. I would would remove the existing Power supply, take measurments and start looking from a well known source IE: http://www.newegg.com/Power-Supplies/SubCategory/ID-58
Something around 400-500 watts would be great.
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Message was edited by: marAz14

marAz14 wrote:
Ive been reading through problems where machines wont startup...only the flashing icons and clicking...still I cant find a solution...is my machine finally failing ?
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