That is the file that your computer looks for to Boot up the operating system software. Either your OS (operating software) is corrupted or your hard disk drive might be defective. Here is a link to your model: ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-740_user%27s%20guide_en-us.pdf Select the appropriate model and then view diagnostics or troubleshooting links to see if your hard drive is bad. If the diags pass on the hard drive test, then you will need to reload software.
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That is the file that your computer looks for to Boot up the operating system software. Either your OS (operating software) is corrupted or your hard disk drive might be defective. Here is a link to your model:
ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-740_user%27s%20guide_en-us.pdf
Select the appropriate model and then view diagnostics or troubleshooting links to see if your hard drive is bad. If the diags pass on the hard drive test, then you will need to reload software.