Hp 300-1223 window 7 want shut down with power also the screen black

[alvin2948]

all in one 300-1223 that want shut down with the power button every still run's and the scrren stay black when power up .Using window's7. Help please

[Danjen]

Have you run a full virus scan?

[alvin2948]

Thank's for answer how can i run full scan with black screen .What would be the best to use to scan ? Please explain how to

[Danjen]

It could be the power supply, shorted device of any kind attached (bad printer, flash drive, keyboard, mouse, network connection), memory problem, video card fan not spinning and the video card could have overheated, bad capacitors (rounded or leaking a brown or dark substance). The first think you should do is make sure it is not under warrantee.  If it is, contact HP.  If it isn't, remove the cover and inspect the board for bad capacitors, fans not turning, disconnect all non essential items like the hard drive, DVD, floppy if you have one, all external devices (yes the monitor) and turn on the computer. Does it appear to stay on? If yes, shut it down by holding in the power button for 5 or more seconds or flipping the power switch on the power supply or pulling the plug. Connect the monitor and then one item at a time leaving the hard drive with your important data as the last item. If it didn't stay on. Try to use only one piece of memory and try each memory slot, try the next piece etc. If that doesn't work, the best guess is the power supply (if you have an ohm meter - test the power supply first).  You can run a anti-virus/adware/spyware check by removing the drive and attaching it as a 2nd drive on another machine.  You could also run a check disk while it is there.  I like to download the hard drive manufacturer's disk certification test iso image and make a bootable cd.  Boot off the cd and test your drive.  It can fix bad sectors and some minor drive problems.