After I realized I had an old Dell Inspiron Mini that was really slow, I decided that since no one used it, it would be perfect to turn into an alarm clock.
First, you'll need a clock screensaver. (skip this part if you don't want the clock but want the alarm)There are many different ones you can get, but for this one i'll be using this flip clock. If you are going to use this one installation is simple, just unzip after downloading and run the .exe file on windows or use the DMG file on Mac. But since I was running Windows 7 Starter, I had to use a program called Starter Background Changer to set it. On any other version of Windows you can set through the personalization settings in the control panel. To set the alarm, I used a program called Free Alarm Clock for Windows.You can find it here: http://freealarmclocksoftware.com/ You can use similar programs if you have a Mac. Just Google Alarm Clock for Mac. If you are not going to use the screensaver, you can just set the alarm and leave the laptop on or you can look online for tutorials to set it while leaving the laptop on sleep mode.