If you mean how to get the side panel off the case, there is a little black lever on the backside of the case. Simply pull down on the lever, and you should then be able to slide the side panel off (slides toward the back).
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(Befor doing below steps be carefull with the power code, remove all the connector from your PC) I am going to tell suggest you to open the case and try removing 1.RAM from the RAM slot, clean it and put it back.(if there is any small speaker attathch with your motherboard then the moment you'll remove the ram you can hear long beep sound from the CPU. if you can hear that means your MBoard is fine and there must be some problem with your RAM) 2. There you can see a small battery, remove it and put it back after 10-20seconds.
The beep codes indicate there is a problem keeping it from starting. You code post the model, etc. of the computer, and the number of beeps, and if there are long or short beeps. Mostly these are memory and/or video. If you can, disconnect the hard drive, cd, and any extra cards (sound card, modem, network). Re-seat (remove and re-install) RAM and video card, then try it again. Re-post if you are still getting beep codes with # of beeps, etc.
According the the dell specification you can only install up to 4gb, so I don't understand you saying that you were upgrading from 3gb to 6gb. Make sure that all the ram that is installed is of the same brand and speed (667 / 800 MHz Dual Channel Dual DDR2 SDRAM). The fact that it is saying no boot device also would suggest that it is possibly something wrong with your harddrive, whether it was corrupted or damaged while you were changing the RAM, if you have a spare harddrive try installing and booting from it. If that doesn't work it could be a motherboard issue, which the BIOS should be update, all the jumpers on the board should be checked etc. Its rather hard to diagnose a problem such as this, and the fact that after you installed the new RAM, even the old RAM would not work, suggests that you may have damaged something while messing around in the computer.
Somewhere on in the tower there should be a sheet representing what formations of lights mean which... Maybe you got bad RAM? Maybe your Harddrive is dead? Maybe your motherboard is fried. I should tell you. Good luck.
pull out everything in the computer except what's required to boot...so any pci cards or video cards (if you have onboard video). you can also try pulling out the ram (while unpowered AND unplugged) and then booting to hear beeps...if you pull the ram out and the computer doesnt make a sound, its probably a bad motherboard and needs to be replaced. if you hear beeps, try replacing the ram or disconnecting other parts...like harddrives, optical drives, modems and what not.
could be a couple of things, usually when you get the BSOD (blue screen of death) there is usually a ram problem, have you noticed your pc getting slow, sometimes the ram sticks break down over a period, try getting hold of a memory tester software and checking the PC, this is usually done through the inital start up before windows is loaded, please ensure though that if you need to get more ram that you use the correct one for your motherboard, buying incorrect ram can cause more problems and is a waste of money, www.crucial.com is good for checking ram in pcs, also you need to make sure that if it says low density you use low density ram, or high density for high density. also make sure that you buy the one with the correct amount of pins.
External HDD are similar to the normal internal HDD, only difference is
that The physical harddrive is only place into the casing with usb
terminal port so you can remove the physical HDD. Your casing's usb
terminal may be damaged. Borrow a casing for a external usbHDD from a
friend that is working and use it to extract your data to a PC.
Hope it helps.
Check your motherboard manual to see the voltage suppied to the new RAM. Check the Ram specifications and note the required voltage for it to operate correctly. In a lot of cases the motherboard will not supply enough power all the time and can cause shut-downs and restarts.
If the RAM need more voltage than the motherboard supplies, replace it with RAM From the qualified vendors in the memory section of your motherboard manual.