Computer stops working

Well, my MT box is PII 500 MHZ siemens, mt is installed on a hard drive, and worked for some time OK, but about month ago it just stops responding, there is no signal on the wifi cards, and I cant ping ethernet card, when I restart the MT I mean pull the plug and then again plug it in back, MT loads and everything is fine in the log I cant see anything because there is no log just log of last boot…

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