You can use this to view the various sensors on your computer. A reasonable operating temperature range of a laptop hard disk is 5-60 C, but temperatures between 35-45 C have lower failure rates over prolonged exposure. You can get exact figures if you look up the model number of your hard disk and find its spec sheet. More likely, though, is that it's just a slow hard disk. You could try defragmenting, running windows disk cleanup, or closing unwanted background programs with the task manager.
Have you registered the phone on a carrier's network yet? They have to activate it for it to place normal calls. Call their customer support or bring it to a store. Be ready with the number printed on the SIM card and the IMEI, which is under the battery.
On most modern vehicles, the fuel filter, fuel pump, sensors, and other ancillary hardware are all located in the gas tank. They're designed to last the life of the vehicle and as such aren't easy to service. Gasoline is pretty clean these days so there's little reason to change the filter unless you have a specific reason.
Try using a microfiber cloth or lens cleaning cloth and some isopropyl alcohol to clean the lens. Otherwise it's probably banjaxed. Component-level repair is generally not done on PC parts, especially optical drives, which are pretty complex mechanically. I've had a good amount die on me for various reasons; bearing fails, laser carriage or tray gets jammed/derailed, etc. Something just gets tired and gives up the ghost, you know how it is. Send it back if it's in warranty. If not, CD/DVD writer drives are not expensive, one can be had for $30 or so, and replacing one is generally trivial.
There is an aftermarket kit around called Afterburner. It is a frontlight based on a few white LED light strips. However, it involves almost completely dismantling the GBA to install it, a 30 percent reduction in battery life, a washed out and trapezoidal-shaped shadow effect on the display (because it's a frontlight, not a backlight, and it's not originally designed for the system, respectively), and requires some soldering. It's even hard to find one now, because the company that manufactured them has gone under from some legal something-or-other. Of course, you can always get something like these, which just plugs into the EXT port in the GBA and draws power from it to run an LED, which shines at the screen. Simple. I suppose you can make one if you had the components and skill, but I would advise against it and just get an SP, especially the backlit model (does "Now with a BRIGHTER backlit screen!" ring a bell?), as it is much better than the frontlit one. SP's are only about $40 used nowadays, as...