|Various splitter cables are available, one of which splits a psu power plug and provides two output power plugs for people with problems such as yours.|
Generally they are inexpensive and I would suggest looking on ebay, or a local computer fair if you have one.
For example, check out item 280365482493 on ebay uk. Would this work for you?
Advise back how you get on.
Good Luck - Keep us posted.