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Answer» hello every one i have a very strange issue on my desktop PC first my motherbord is p45 memorylover my cpu is Q9550 and 8 gb ddr3 ram , graphic card is 5970 i have to sata hard's the first is 500GB and the second is 200GB yasterday : my pc was running fine until there was temperature problem cause the cpu fan does not WORK fine so i changed it to THERMALTAKE cl-p0493 x5 orb fx ii and after that the PC doesn't start until many tries of changing cables slots etc (i thought this is the problem) and no problem at all today : the pc doesn't start it says boot mcr is missing so i changed the the sata cables slots places of hard drive (cause the mobo doesn't see the first hard witch the windows is installed in) and the cables too but there is now boot loop, i have tried to enter the bios settings and i succeed and after i put ESC in bios and hit okey (exiting bios settings ) the PC restart normally and enter windows with out any problem so the problem now there is a boot loop could not be solved with out pressing DEL and enter bios the restart !!!!! so this is the only way to start the PC : power on >>> entering bios (change nothing) >>> exiting (nothing changed)>>> start windows normally ? by the way the new fan has only three pins not four so the bios only recognize the cpu temp and not rpm but i don't think the problem form it cause i removed its connector with out removing new fan form cpu and i connects only my old cpu fan cable and the problem still exist so please any IDEAS !?What exact motherboard do you have, and what BIOS version is it currently on? What exact memory do you have?my motherbord is msi p45 memory lover my bios ver is 1.3 4 rams every one ram is 2 gb ddr3 1333 totally 8 gbNormally this problem is caused by either the BIOS version or the memory settings. Your BIOS is already up to date, so that's OK. Check your memory settings in the BIOS and make sure the speed, voltage and timings match up with what's printed on the side of the sticks.i have checked the speed of the cpu and the ram and every thing is okay but do you think i have to change battery of the mobo ? maybe its bios problem cause i reset the bios yesterday when i checked the cables but it saves every thing ! i don't know ,, Shut down your computer and DISCONNECT the hard drive that Doesn't have Windows installed on it. Insert your Windows installation disc, boot to it, select language, click repair, run the automatic startup repair feature then try booting again. If that doesn't work then boot to it again and go to the command prompt. Type bootrec.exe /fixmbr and press enter. When that finishes reboot and see if it works. You said you have two hard drives, this can be caused by having both plugged in when installing Windows in which case it installs the bootloader to the secondary drive instead of the system drive.i offten get thins on my pc usaly when i have a usb in the usb ports when im booting up (i have boot of usb enabled) to its worth a check of making sure you don not have any usb sticks plugged it upon boot
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