My Dell 4300s suddenly won't boot past the dell logo. I discovered that after removing both the keyboard and the mouse, the computer booted up fine. When I plugged in the mouse and keyboard they did not work. I turned it off, removed the keyboard and mouse and it booted fine. Is there a way to fix this? It looks like the keyboard and mouse plug-in thingys go right into the motherboard. thanks for any insight.

1. Check you didn't switch them and connect to the wrong sockets.

2. Try using a different keyboard and mouse.

New Mouse/Keyboard did the trick, thank you!

Er, just a new keyboard may have worked, as in your bios it probably has hault on keybaord error