I went to add RAM, and realized I bought DDR2 and the PC used DDR. But I didn't realized this until after I tried pushing them in...I'm a noob .

Ok, so I just stuck the original stick of DDR back in and closed it up and hooked it all back up, turned it on, and nothing comes on the screen. Fans are running though. No beeps or anything. I took the stick of DDR out (no RAM at all in it) and turned it on and there were no beeps either. So I'm guessing the RAM slots are damaged and maybe then clips? I tried sticking it in the other RAM slot, and the same thing happens.

Any help would be wonderful! and appreciated!

Try resetting the CMOS.

Consult your manual on the details.

This is achieved by either removing the battery for a few minutes and or a jumper on the motherboard near the battery that might say JBAT or CCMS or some such.

If it is jumpered move the jumper from 1/2 to 2/3 for a few minutes then move it back.

This will set the BIOS to Default which may "wake up" the mobo.

Originally Posted by jephree

Try resetting the CMOS.

Consult your manual on the details.

This is achieved by either removing the battery for a few minutes and or a jumper on the motherboard near the battery that might say JBAT or CCMS or some such.

If it is jumpered move the jumper from 1/2 to 2/3 for a few minutes then move it back.

This will set the BIOS to Default which may "wake up" the mobo.

Thanks for your reply. I took your advice and did both. (at different times of course) and the same thing happens. I them out (one at a time) for about 2 minutes and then put them back, and turning the PC back on, and still nothing shows up on the screen and no beeps. I tried a different PSU and it did the same thing. Im confused

Do you remember the computer ever beeping?

Generally on a successful boot there will be a single beep.

Point being: did your motherboard or case speaker ever work?

If it does indeed work and you are getting no beeps this is troubling.

What is the make and model of the motherboard?

I didn't really listen before, so I don't know if it ever beeped. It is a Compaq SR1120NX. I didn't see anything useful on the motherboard itself to identify it. Thanks for the help, jephree.

Here are some other ideas. Let us know if anything here helps or not.


Compaq Presario SR1120NX Desktop PC

Step 3: Resetting and updating the BIOS
In case an item was changed in the BIOS, such as the primary display device setting, use the following steps to reset the BIOS back to its default configuration:
Turn on the computer and press the keyboard key that enters the BIOS Setup screen key when the keyboard light comes on. The key to enter the BIOS should be one of the following:
HP and Compaq desktop computers that came with Windows Vista, press F10 .
For HP Pavilions desktop computers that came with Windows XP or previous versions of Windows, press F1 .
Compaq Presario desktop computers built after 2002, press F1 .
Compaq Presario desktop computers built prior to 2002, press F10 .
Wait 5 seconds.
Press the F5 key to restore the default settings of the BIOS.
Press Enter to accept the change and wait five seconds.
Press the F10 and then the Enter key to save the changes and exit from the BIOS.
The monitor should now display the first screens received from the computer (the logo screens). If not, find and download the latest BIOS update if one is available for your computer.
If a BIOS update was not available or the monitor is still blank, continue to the next step

Monitor is Blank after Starting the Computer


Removing and Replacing the CMOS Battery


Updating the BIOS

I tried all of it except updating the BIOS. Nothing helped. Do you really think updating the BIOS would help? Thanks

UPDATE:
actually i wouldn't be able to because I can't see anything on the screen, right? ughhh...doesn't this sound like a bad motherboard? it doesn't make sense though, because all I did was open it up and switch the RAM...??, nothing else!

Doesn't make much sense.

Using the wrong RAM should not have damaged the board.

I would break it all down and redo all your connections.

Then try one stick of your old RAM. Make sure it is seated properly.

If still no go try the one stick in different slots.

Then try one stick of your old RAM. Make sure it is seated properly.

This may seem like a stupid suggestion, but its a possibility: are you sure you put your ram in properly?

When I was building my first system, I remember it wouldn't start. Eventually I figured out that the problem was that I didn't push in my ram far enough. You really have to push hard, until it clicks.

Once again, sorry if suggesting something this simple seems like an insult but often the simplest solution is the right one.