It's possible you knocked something loose when you were cleaning the box. It's also possible you damaged or shorted something. First, open the box and check ALL connections. Then let's check the hd and memory.Hard Drive Diagnostics:http://www.tacktech.com/display.cfm?ttid=287
Make sure, you select tool, which is appropriate for the brand of your hard drive.
Depending on the program, it'll create bootable floppy, or bootable CD.
If downloaded file is of .iso
type, use ImgBurn
to burn .iso
file to a CD (select "Write image file to disc" option), to make the CD bootable.
For Toshiba drives, see here: http://sdd.toshiba.com/main.aspx?Path=ServicesSupport/FujitsuDrivesUSandCanada/SoftwareUtilities#diagnostic
To check the ram, download memtest (http://memtest.org/
). Burn it to a cd using a dedicated .iso burning utility (http://www.petri.co.il/how_to_write_iso_files_to_cd.htm
), make sure the cd drive is at the top of the boot order in bios, then boot to the newly created cd and run the utility.