20 Most Recent Dell OptiPlex 740 PC Desktop Questions & Answers

Sounds like you are describing a binding issue with the latch.

From this video link, showing no physical lock in the latch handle hole, a good working case latch opens the cover easily.

https://m.youtube.com/watch?v=oKDzYhTfAXk#bottom-sheet

Tolerances changing on metal parts like slides can cause binding.

Sometimes a stuck case can be opened using gentle pressure, noting where you push, or tap on case around the mechanism as you put pressure on latch, trying to remember where you press in an organized way, so you don't repeat what doesn't work,
It's organized luck,
look in video how latch is constructed , turn case
To accommodate where gravity might help, small chance.

You have to go back into the bios and make all the setting correctly match what you have for hardware.

its only for beeps

There must be a service jumper you must remove

Try to use some password remover...or find some tool in Hirens boot http://www.hirensbootcd.org/download/ Regards, Jovan.

Most desktop CMOS batteries are CR2032 button type battery that you can find out Radio Shack, Walgreens, and even online retailers. These batteries aren't mean to be recharged, and you can find them for prices around $2 to $15 each, depending on where you shop.

Here is the link to the manual that shows you how to remove the ram, http://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-740_user%27s%20guide_en-us.pdf Just scroll down to the page of contents Hope that was helpful

most dell pc,s have a button or a slide latch the button ore large on the top back edge some have one on top and one on the bottom . the slide latches are on the back looks like a on off slide switch usually near the the bottom about 4 or 5 inches from the bottom on the right side facing the back of the computer . But in your case i think it is screws holding on the side plate , find the finger slot and take the three srews off that side the plate should slide straight back and come off !

Have you tried hitting F8 when starting up? If you can log on, maybe try this; http://www.brighthub.com/computing/hardware/articles/57690.aspx

hello Here is how the cmos battery looks like(look at video) at 2:15 running time of video shows you the cmos battery that is simular to a big watch battery. here a link for battery http://www.ebay.com/itm/Dell-OptiPlex-Desktop-New-Motherboard-Lithium-Battery-Bios-CMOS-3V-Clock-CR-2032-/200692910229?pt=LH_DefaultDomain_0&hash=item2eba3ac895

This could be a number of things 1. Firewall 2. virus protection settings or web control 3. Router settings 4. Perant control These are to most likely cause.

Restart your computer, and just before the Windows logo appear start tapping F8 on your keyboard. There should be a list of option appear on the black screen. Select the option "Safe Mode" by pressing Enter, wait till the loading. The screen should appear with two or more account including Administration account. login with its password and change the password from control panel

I think you are running on Windows vista or 7, in this case you have to remember the Administrative password. Reboot your PC and before Windows logo arrive press F8 couple of times, a list of option will arive, choose "Safe Mode" you should be able to login with an Administrative account. From there go to ccontrol panel> accounts .. delete the account and add a new one. In case if you forgot the Administrative password you have to hack into the system and delete the account: How To Reset Windows Vista Password

replace the keyboard with PS2 keyboard and try again! if that cannot do changes then your PS2 or USB port are dead!

try DriverBooster.com , it also come free with Advanced SystemCare7

Sounds like it may be in "sleep" mode. Try pressing the power button quickly (press and release). If that does not work just unplug the machine, wait 30 seconds and replug. Turn it on and see if that corrects the problem.

Try to get a paste on the processor and make sure ur fan is working properly.

Is there a disk that came with your computer labeled factory reset disk?

Your computer has an on-board graphics card, which is usually sufficient unless you're going to be playing Full HD games on your computer.