computer rebooting

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hi all i have a problem with a pc i have just built 4 identical machines but one of them keeps getting errors and shutting down and restarting there spec is as follows
512mb DDR PC3200 400MHz 184pin
LG GSA-4167BAL 16x DVD±RW Dual Layer Internal
LG GDR-8164BL 16x52 DVD-ROM Internal
Seagate ST3120022A 120GB 7200RPM UDMA/100
Sapphire Radeon 9250 128MB AGP8x DDR 64-bit DVI-I TV-Out
Microsoft OEM Windows XP Home Edition inc SP2
300W ATX Power Supply came in the case
PC Chips M848ALU SKT A SIS 748 400 DDR AGP 8x ATA133 6Ch Sound/LAN/USB 2.0 for Athlon or Sempron CPUs
amd 2800 processor socket a
Linksys Wireless 54mbps PCI Adapter Card
Foxconn (NBT-CMAA42BX-C) Up to Athlon XP 3200+, Sempron and all Socket A Including Duron CPU Cooler
as ive said ive built 4 of these machines all identical but one of them keeps getting error messages regarding hardware fault then restarts and says the system has recovered from a serious error but the other 3 machines are all ok with all the same software on the messages i get are as follows
catergory 100 event id 1004
faulting application lsass.exe version 5.1.2600.2180
faulting module. rpcrt4.dll version 5.1.2600.2180
fault address ox0006edf1

and also
error code 1000000a parameter1 00230090
parameter2 00000002. parameter 3 0000001 paramerter 4 804e7acf

can anyone tell me where to start to find the fault as it is doing my head in now it just seems strange that all machines are the same but only 1 has the fault as they all have the same hardware and the same software
any help would be appreciated
many thanks in advance
 
have u tried switching the psu's from to another ? maybe use parts from the bad one put it into good ones and see how they work . could be bad memory or overheating ...
 
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