I recently received a fairly new sony vaio PCV-RS720G computer from a family member after it had been sent to the company to get the hard drive fixed. They had not turned it on since they got it back but when I did the keyboard and mouse will not function. They are PS-2 connected. I also tried to plug in a usb mouse and that will not work either. When they are pluged in and the computer is on they light up so they get power.
This may be obvious but please do check the connectors, sometimes they are loose or sometimes they are connected to each other inputs.
Also check in the bios configuration if you have the "plug and play" option active so the PC will recognize any new peripheral when it is plugged in.
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there is a software you installed in your system that might mislead some dll to function restart. try to removed some recent software you installed, do it at once. but first try to update your antivirus and scan the system.
Hi there Boot up in safe mode, F8 on start up, if it lets you into windows, go to the device manager and uninstall the graphics drivers, then reboot the pc, let the PC detect the new card and try install the drivers, have your driver CD in the CD drive just in case it needs it.
From the looks of things that model will take a standard ATX power supply which would be available from and computer part dealer and ebay etc, get yourself a nice 400w replacement try and get a small form factor one if you can as it will be a tight sqeeze inside the case.
when replacing it you will have to open the case up (get an anti static wristband if you can, and work on a table rather that a carpeted floor) un hook all the connectors the old power supply (one in each drive and there should be 2 in the motherboard) you may have to pull the Dvd rom out slightly to get the new supply in, unscrew the 4 case screws holding the power supply from the back of the case. lift it out then put in the new one, screw it in using the case screws and connect up the internal power cables to the drives motherboard and new graphics card, close the case, plug in and voila