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.
Fatigue. Fatigue is another sign of computer vision syndrome. Looking at a computer screen with untreated vision problems can lead to eye and general fatigue. Overall fatigue from working too long at a computer and concentrating without blinking, combined with poor lighting, can result in vision problems.