I have an ibm ThinkPad r40 laptop. When I turn it on, sometimes it beeps 3 times (one long, two short) and the screen remains blank. Other times, when I turn it on, the ibm screen comes on, but it starts to flicker and then lines start to appears on the screen and it goes blank. What is wrong with my laptop? Is it something that I can fix or will I have to get it repaired?