sherlock@vsnl.com wrote:

Newer serial mice use only the rxd pin (data into the pc) for communication and the handshake outputs from the pc as their power source. If the serial driver on the mobo is unable to source sufficient current - they are not supposed to supply more than a few milliamps - it will burn out. Very old serial mice used power from the keybd din connector which is designed to supply about 100ma.

The mobo is an 810 type kob...(can't recollect, its with the repairer) with on board sound and pci display card. I called up the customer again and he has been using the mouse (intex 3 button) since one year.

He started getting problems recently that whenever he connected to the net using his reliance fwp with serial cable, the mouse would stop. He brought the machine to his office so I could check it up (suspecting software problems) but unfortunately for him, it simply did not start at his office and I had to give it to the repairer. The repairer claimed to have replaced the bios chip and later the com port chip as it was not working.

The machine then worked for 2 days at my place and 4 days at the client's with the reliance fwp. However it developed os bootup problems and when I brought it to my place, his ram turned out to be the culprit. Using my ram I formated and loaded the os and found that com1 was not working. I pointed a finger at my repairer that he had simply soldered some dry points and claimed to replace the com chips. He became very upset and revealed that he had actually replaced the mobo itself with an identical working one and now he was convinced that it was the com device that damaged both the boards. He is threatening to sever ties.

I am in a fix what to believe.

Regards,

Rony.

___________________________________________________________ How much free photo storage do you get? Store your holiday snaps for FREE with Yahoo! Photos http://uk.photos.yahoo.com