No mouse or keyboard function after new power supply instal

June 3, 2013 at 17:29:51
Specs: Windows XP
Replaced the power pupply after my P-4 Sony Vaio desktop (with XP) went dead. Unbelievably, it started right up - I'm new - but I had no mouse or keyboard use. It booted to the Windows log on, but I could not log on or even go to the set-up menu. I read some posts and decided to replace the CMOS battery. It fired up again and now I'm getting a "CMOS checksum error - defaults loaded" message with "press F1 to continue" or "F2 to Enter Setup". Can't do either without a keyboard. I have both USB and old school ports and have tried both. I have checked all the components for snug connection, too. I cannot do a thing at this point. Please offer any helpful advice.....

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June 3, 2013 at 18:31:53
When the power supply died it may have damaged the motherboard.

PS/2 keyboard and mouse are not hot swappable. Hopefully you did NOT connect either while under power. That could damage the PS/2 controller. Most older motherboards have a setting in the BIOS that must be enabled to be able to use USB hardware in the screens prior to entering Windows.

Did you connect the secondary square, 4 pin power connector to the motherboard?

Only thing I can think to try is to unplug the computer and press the start button a few times. Plug the computer back in and try booting again.

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June 4, 2013 at 07:03:38
Yes, I plugged in the same four connectors from the power supply that I unhooked when replacing it.

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June 4, 2013 at 14:32:59
Did you connect PS/2 keyboard or mouse when the computer was running?

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