From the razerzone website
It has been brought to our attention that the recently-released Razer DeathAdder firmware 1.21 has experienced some compatibility issues with some PC motherboards* (full list of affected chipsets and motherboard below) that were recently released in the market. Such issues include instances where the mouse has intermittent power issues and exhibits undesired performance issues when plugged into this isolated range of PC motherboards.
We have released a new firmware update (Razer DeathAdder firmware version v1.25**) which addresses these compatibility issues for all Razer DeathAdder mice that are already on firmware version 1.21. Please note that all other owners of the Razer DeathAdder not using firmware version 1.21 (i.e. firmware version 1.1) are not affected by this compatibility issue.
In the meantime, all users with a Razer DeathAdder gaming mouse on firmware version 1.21 are advised to upgrade their firmware to version 1.25, even if your motherboard is not amongst those listed. This is to prevent any inconveniences that may occur should the mouse be brought to any LAN events and/or tournaments with computer systems using the conflicting PC motherboards.
For further assistance, please contact the Razer support staff. Further FAQ can be found here
Download firmware version 1.25 and driver version 1.08 here
http://www.razersupport.com/index.php?_m=downloads&_a=viewdownload&downloaditemid=99&nav=0,11
* List of Motherboards
• Intel 865P Chipset
• Intel 865PE Chipset
• NVIDIA nForce4 Ultra Chipset
• NVIDIA nForce 680i Chipset
• NVIDIA nForce 650i Chipset
• Intel P965 Express Chipset,
• Intel P965 Northbridge, i82801HR Southbridge
** Requires Razer DeathAdder Driver version 1.08
