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I have a dimension c521 dell desktop and I cant boot the system it says keyboard failure and it have only usb connections.. I tried few different keyboards but same story pls help me
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1 long and 2 short beep code means your Memory (RAM) has gone bad and needs to be replaced. Your system made a Memory test and the test is a failure (bad memory during memory sizing).
Here's a guide for Beep Codes on your Dimension model: Click Here
A solid amber light indicates a pre-POST failure has occurred. The system has received a Power Good signal from the power supply so it's not a power supply issue. HERE is the documentation that tells what the lights mean and possible solutions.
Most C521's have no floppy, if you have none:
boot to the BIOS, (F2 at boot) go to the drives setting, diskette (May be listed as floppy disk drive) set to NONE, exit and save settings
How old is the computer, could it still have warranty? USB ports are often protected with fuses. Some latest stuff has resetable fuses, but many are one-time that do not heal. Did you try the keyboard in the front USB's The thing of biggest concern though is that this happened in coincidence, meaning you may have a motherboard hardware failure. (the reason I mentioned warranty)
Do you have a ps/2 keyboard/mouse? Or a usb->ps/2 adapter. I'd say boot up normally and log in with the ps/2 keyboard/mouse. Then, from device manager, right click everything under USB and such and uninstall. Then right-click your computer name in the device tree and scan for changes.
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