I have installed SanDisk SSD 240gb in my Pavilion dv6-1362dx some days ago and am having SATA AHCI Mode enabled. I did not had any issue during the installation but I donít know what went wrong with it today morning. When I turned it on then I got an error message saying "Operating System not found". I am having windows xp installed on it, I have tried rebooting my laptop a number of times and have reseated SSD again making sure that there is no issue with the connection part but no avail. I am still getting the same error message. I donít have much data in ssd as I took backup of all crucial data in it. I wonít mind formatting the drive and reinstalling windows on it but I wanted to know if there is anything else that I can try out rather than that, I have kept reinstallation of windows as my last option.