The overall ratings of three Computer and Personal Electronics stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Diebold (NYSE:DBD) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Diebold is engaged in the development, manufacture, sale, and service of various products used to equip bank facilities and voting equipment, including self-service transaction systems, security systems, and software. In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Surprise, DBD also gets F’s. The stock price has fallen 7.5% over the past month, worse than the 2% decrease the S&P 500 has seen over the same period of time. To get an in-depth look at DBD, get Portfolio Grader’s complete analysis of DBD stock.

Synaptics (NASDAQ:SYNA) ratings are on the decline this week as the company earns a F (“strong sell”). Last week, it received a D (“sell”). Synaptics is a worldwide developer and supplier of custom-designed user interface solutions for a variety of mobile computing, communications, entertainment and other electronic devices. The stock also rates an F in Earnings Revisions. As of Oct. 26, 2012, 17.7% of outstanding Synaptics shares were held short. For a full analysis of SYNA stock, visit Portfolio Grader.

EMC Corp. (NYSE:EMC) is having a tough week. The company’s rating falls from a C to a D rating. EMC develops, delivers and supports the information technology industry’s range of information infrastructure and virtual infrastructure technologies, solutions and services. Share prices fell 11.2% over the past month. For more information, get Portfolio Grader’s complete analysis of EMC stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.