My laptop will not boot, the screen comes on and the dell logo is there and the lights flash around the like it's trying to boot and then it goes dark and that's it.  When I check the setup it can find the hard drive, it lists it by the HDD.  When I run diagnostics it fails with short test unsuccessful.  I have reseated the hard drive and tried to reboot,  but it is not working.  I'd like to run chkdsk /r from the command console like I saw in one of the possible solutions, but I don't know how to get to the command console.  I'm thinking I need a new hard drive but I would like to try everything to save this one first.