Hi, I had some problem with the power supply(it turned off after some while) and I thought that removing the dust with using the hair blower could help me so I did some cleaning and I switched on but nothing appeared and theres no beeps and nothing appear on the monitor I checked the monitor and the Vga card but still nothing so I changed my power supply with one from another computer I used to had but still the problem is still the same no display no peeps

I dont know what problem this could be( before cleaning with hair blower it used to work but just switches off after a while )

I have deleted your other 4 duplicate threads.

I assume the heat was off, right?

I would go back and double check all your connections - if the old power supply worked, and you know this one is good, it should work. It is easy to knock something loose while digging around. Also, some PSUs have a master power switch on back - make sure it is set to on (1).