I have a Dell OptiPlex 745 and I changed my System Password to nothing. If I start up my PC it says I have to enter my password, but when I don’t enter anything it just asks again, Old password doesn’t work. I have tried a lot of key combinations, but they don’t work. Please Help!
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If you can’t figure out the password anymore, reset the CMOS:
Look for the “password reset jumper” inside the box.
ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-745_user%27s%20guide_en-us.pdf
Clearing CMOS Settings
1. Follow the procedures in Before You Begin.
2. Reset the current CMOS settings:
a. Locate the password (PSWD) and CMOS (RTC_RST) jumpers on the system board (see Jumper Settings).
b. Remove the password jumper plug from its pins.
c. Place the password jumper plug on the RTC_RST pins and wait approximately 5 seconds.
d. Remove the jumper plug from the RTC_RST pins and place it back on the password pins.