System: Dell Latitude CPx-H 450 Mhz PIII Notebook with 128Mb RAM, with two DIMM slots. Problem: Upon installation of additional 128Mb RAM (PNY Technologies), system resets constantly upon load of Windows ME. No safe mode nor step-by-step mode with no drivers loaded would generate a successful start-up w/o resets. Actions taken: 1) Thinking the new DIMM defective I exchanged the new 128Mb DIMM for a new 256Mb. Exact same problems encountered. 2) Booted computer using each DIMM individually with no problems. Only when the two chips are both installed is there a problem. 3) Have switched both DIMMs between slots (128mb and 256Mb in Ports 1 and 2, respectively, and then in Ports 2 and 1, respectively). No change- computer resets continually whenever both DIMMS are in. 4) Ran MemTest86 with the following results: a) With only one DIMM in the system at a time, neither DIMM generated any errors after 3 passes. b) With BOTH DIMMS in the system, one error was generated after 1 pass in Test 7. Question: Is it possible that these two DIMMS are incompatible with each other? Any advice? Thanks in advance. Chris

hello i read in a diferant forum that difreant brands of ram can sometimes not work on some computers and some times same brands but difreant sizes will not work. ive got two difreant sizes and brands in roung slots and it still works.i beleave it depends on how well your mobo was planed out.you might try a google search on your mobo manual see if at your mobo,s home page any isues listed for this.and on the ram problem.are the ram the same brand bout all i got for you have a nice day

hello cmotes are both your ram slots working? Have u tried to experiment whether one of the slots is defective? Your description of the problem didnt include testing the slots....

Zed- Please let me know how to test the DIMM ports, I don't know how. I did move a DIMM for slot 1 to slot 2 (thus slot 1 is open instead of slot 2) and I'm able to boot and run the machine no problem. Post #2's suggestion makes sense... this might be a compatibility issue between two different brands of RAM. Thanks