For making your own flywheel steel should do fine. You're probably not aiming for an 80,000+RPM flywheel that rides on magnetic bearings. So composites shouldn't be needed. The best material, eventually, for flywheels should be carbon nanotubes. They have huge tensional strength, but lousy compression strength. Tensile loads is what a flywheel has, so they'd work great.
It is important to note that not all batteries associated with these computer models are affected. The company is directing all users to its HP Battery Recall website to go through the online validation and replacement process.
My Computer has a nasty virus, and I want to restore it back to Factory Settings, like it was when I first bought it. It's a HP Pavilion Desktop, which did not come with recovery disc. It says to hit F10 for System Recovery. I did the complete recovery twice this week, and when it goes to the home screen, I...