At the risk of misleading you, if I am not mistaken, I think many retailers confuse things. If you purchased your drive in the RETAIL box, you get ONE year waranty. If you purchased the oem version (comes in an anti-static bag) you get the 3 years - It's the other way around and many sites mislead people or are NOT informed properly and think that the retail gets the bigger waranty when in reality it is the OEM version. I can't understand why but that's the way it is.
I have 2 of the DiamondMax 250GB drives myself and they are running perfect.. So your drive lasted 3 years, not bad, considering the poor quality of products nowadays, Keep in mind those maxtor drives are made in China - some say they were better built when made in singapore.
Try shutting down your PC for 30 minutes then power back on and see if your HDD works now. If it does, run the maxtor utility and run a complete check cycle including SMART checking on your drive. If you have a SMART capable software like speedfan (free) or EVEREST or others please post your attribute names and values here I'll take a look at it for you, about 60-70% of the problems can be prevented ahead of time, unless it is an unexpected mechanical failure / crash.
Sorry but it looks like you were not informed properly and if you were mislead or not informed by Seagate/Maxtor themselves then there is a big problem
My personal favourite tool is
It provides more S.M.A.R.T. attribute info than other apps - Run a test on that HDD and post your results, you're drive may not be gone and there may still be hope, I would look for the values of critical attributes (spinup time, seek performance, calibration retries, spinup retries, write errors....)Your data may still be safe, if it is still safe you should back up immediately. Also you might want to check your power supply's voltages and keep an ear on any grinding like sounds coming from your HD.
Before you panic and throw your drive away you might want to take these steps to try to save your data.