"won't let me plug in keyboard or mouse" if they are ps2 keyboard and mouse and you mean you can't physically plug them in, you have to be very careful to line them up properly, another problem is the pins might be bent so you will have to use a very small pair of pliers to straighten up any bent pins.
I think we are not allowed to give direct links but if you click here search through here. You should find what you want for a couple of pounds. Make sure you pick the right connection i.e. usb is male.
A usb keyboard and mouse combination can be as low as £5.
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