I'm trying to add RAM to HP Pavillion 8776C - going from 256mb (two 128mb sticks) to 512mb (two 256mb). System is running WinXP.
Bought 256mb 168-pin dimm 32mx64 sdram unbuff pc133 cl2 low profile.
I pulled out 128mb and put in a 256mb to give PC 384mb. System runs like a champ!!!
I pulled out the second 128mb and put in second 256mb to give PC 512mb. Problems galore. Range from reboot right away (can't even get to WinXP logo), to reboot at WinXP logo (once). Tried Safe Mode, etc - basically can't get past the Safe Mode option screen.
I thought RAM was bad, so got company to send new one. Try that, same result, only maybe got farther. Problems range from reboot right away (can't even get to WinXP logo), to reboot at WinXP logo (several times got this far), to reboot when desktop/wallpaper appear (several times), to reboot when bring up first application (Outlook), to reboot when bring up multiple applications (Outlook, EXCEL, IE). Tried various combinations of the three 256mb and no combination is stable.
Used MemTEst utility, ran tests of 384mb config - no errors.
Ran tests of 512mb config - thousands of errors on Test 7 (random number or something like that).
Ok - so is there simple answer here? wrong memory ordered - then why does 384mb work? is there jumper/switch/thingamabob to click, pull, push, change? if so, anylinks to instrux? I looked for my system info and on HP site - can't find any info.
Any ideas/suggestions greatly appreciated.