Hp pavilion dv4 problem with ram, vista os will not start,

when I have both chips in slots if I remove bottom chip from slot boots fine, i switched chips and both will start os. put back chips in both slots no start all i get is flasing light by the caps button and the scroll key? anybody have an answer for me?
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More about pavilion problem vista start
  1. Put one stickback in and run MemTest86 and then repeat with the other. It'll tell you if the RAM is bad, which given the symptoms is probably the case:

    You'll have to burn a bootable disk to run it.
  2. Both sticks work fine, the bottom slot is not working.....
  3. Best answer
    same problem - thought the video was bad because the LED next to Caps Lock and above scroll lock was flashing four times. It turns out that memory Slot 2 must be bad. Here's how I came to that conclusion:
    1. Followed all standard troubleshooting tips (removed hard drive, memory, left off, discharged by holding in power button for a minute)
    2. Put in one memory module in slot one. System came up with post page.
    3. Put in second memory module. System would not post
    4. Swapped memory modules, leaving Slot 2 open. System posted.
    5. Put memory module formerly in Slot 1 into Slot 2. System would not post.
    6. Put memory module only in Slot 2. System would not post.
    7. Updated BIOS. Repeated steps 2 - 6.

    System consistently boots when only one memory module is installed, and only if that module is in Slot 1 (the bottom one.)

    Hope this may help others who think the mobo is shot. Not a great solution, but at least it boots!
  4. Best answer selected by buwish.
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