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James, It sounds like the refresh rate is set to high. Since you do not mention what OS is installed I have listed information on how to change in Windows,XP. Start the computer and press the F8 key. Choose Safe Mode. Once the system gets into Windows follow the steps below and then restart the computer. If this does not resolve your issue email me at my email address below and include your OS information.
How to Change the Screen Refresh Rate of Your Monitor
Click Start, click Control Panel, click Appearance and Themes, and then click Display.
Alternatively, right-click the desktop, and then click Properties.
Click the Settings tab, and then click Advanced.
Click the Monitor tab, and then click the screen refresh rate that you want to use.
The default refresh rate setting is 60 Hertz (HZ); however, your monitor may support a higher setting. Check your manufacturer's documentation for information about the settings that your monitor supports.
If you use a higher refresh rate, you can reduce the rate that your screen flickers; however, if you specify a refresh rate that is too high for your monitor, your screen may become unusable and your hardware may be damaged.
Changes to the refresh rate affect all users that log on to the computer.
Or your system is giving off a beep code in which case the beeps come in a 3 beep sequence. Below is the beep codes and what each represents.Beep Codes
Troubleshooting steps and more information about the OptiPlex 320 beep
Microprocessor register failure
ROM BIOS checksum failure
Programmable interval timer
DMA initialization failure
DMA page register read/write failure
1-3-1 through 2-4-4
DIMMs not being properly identified or used
Slave DMA register failure
Master DMA register failure
Master interrupt mask register failure
Slave interrupt mask register failure
Interrupt vector loading failure
Keyboard Controller Test failure
NVRAM power loss
Video Memory Test failure
Screen initialization failure
Screen retrace failure
Search for video ROM failure
No time tick
Gate A20 failure
Unexpected interrupt in protected mode
Memory failure above address 0FFFFh
Timer-chip counter 2 failure
Time-of-day clock stopped
Serial or parallel port test failure
Failure to decompress code to shadowed memory
Math coprocessor test failure
Cache test failure Thank You, Dell-Jesse L Dell Social Media and Communities email email@example.com
It is often caused by a hardware failure. The first thing to do is make sure you do not have any USB memory stick type devices plugged in. Computers don't like them plugged in while starting. If still no good, unplug all of the devices attached except for the monitor. By this I mean the keyboard, mouse, ANY USB DEVICES/ but leave the monitor plugged in. Try starting again. If it boots into windows normally, press the power button on the computer to make it shut down again, then plug each thing in one by one and repeat to see which is holding it up. If it still won't get past the BIOS screen, you have an internal problem in the computer box itself. Hope this helps
Check your BIOS setting to see if it detects the hard drive (Primary disk 0). If it can't detect the hard drive then the hard drive maybe faulty. Open the case unpluge the IDE cable from the hard drive and reconnect it again, also unplug the IDE cable at the motherboard and reconnect it again including the power connector on the hard drive.
There maybe an option to test the hard drive in the BIOS, if so use it to test the hard drive.
If the hard drive is faulty, you need to replace it and install Windows, the various device drivers and your programs to get a functioning computer again.
You might consider buying a new computer (it will be faster & better than the old Dell) and you have your new monitor to go with it.
1024 X 768 is the ideal setting for a 17" Monitor. Are you still getting sound output despite the error message? If no sound then your integrated sound card has failed, you will have to install anew one in the PCI Slot, otherwise forget about the warning & keep listening. You could try visiting the Official website to see if any driver updates have been released till date and refresh the drivers(sound) installation...............sodeep PS: Check your Floppy drive? If not working simply disconnect and likewise in the BIOS if REQUIRED.
Check your video card settings. Did it ever work or is this a new monitor? Get the latest drivers from the manufacturer's site and install those. Update Windows too as there may be an update dealing with your monitor.