Guide. An iron test checks the amount of iron in the blood to see how well iron is metabolized in the body. Iron (Fe) is a mineral needed for hemoglobin, the protein in red blood cells that carries oxygen. Iron is also needed for energy, good muscle and organ function.
The following errors are the most common symptoms of faulty (or failing) computer memory modules: 1  Computer memory errors. 2  These include system computer memory errors, or blue screen system crashes that reference memory read/write, parity, interrupt, address, page faults, general protection faults or mismatch errors.
Over time and with regular use, files and folders on a computer's hard drive break down or become fragmented. When computer files are fragmented, they are typically disorganized and in the wrong place. This can cause the system to run slowly and to experience processing problems. Defragmenting the computer gathers and organizes the files, which usually improves retrieval time and the computer's overall performance. For example, a computer program must access various files on the hard drive every time it is run.