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Can you F7 or F8 or whatever your system uses to get into the bios setup screen? If you can accesss that, you can install an operating system. If not, you have an issue. Put an operating system CD in to see if it is recognized for starters.
remove the bios battery for a few seconds...and place it back on ...this will make it see the new ram memory modules...if you are sure they are compatible ..they will work .....in fact ..the ddr1 333 512 M is more that compatible with your system and it will work after you remove the battery ...\ my recommendation is to reinstall a clean operation system after you boot up ...and format the C partition too...this have to be done after memory changes to get the max out of them ..
You mentioned that you uninstalled the unknown device from the Device manager. If you uninstall it then connected your usb flash drive you will see an error again on your device manager. This means that the driver for your usb port is not properly installed.
To install it, visit dell website, look for the model of your machine and locate the driver, download it then install from your machine.
Verify on the label of the the memory Dimm that you installed that it is PC2700 SDRAM.
Memory Upgrade for Dell Inspiron 1200 Laptop, the Dell Inspiron 1200 Laptop takes the PC2700 DDR SDRAM SODIMMs. Memory Type, and comes installed with 256 MB (non-removable) of Memory. You can upgrade your Dell Inspiron 1200 Laptop to up to a maximum of 1280 MB Memory, the system has 1 socket to install Memory, already with 256 MB (non-removable) standard Memory installed. For best Laptop performance use the maximum amount of allowed Memory per slot for your Laptop. Standard Memory
256 MB (non-removable)
PC2700 DDR SDRAM SODIMMs.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe