My hp dv6428 was running yesterday morning, but then it suddenly froze when I was not using it. I performed a hard reset, but the machine will not boot up. The power turns on, and I hear the disk spin for about 2 seconds, but then nothing else happens. Sometimes the computer will reset itself continually.
I have already done the following:
-performed hard reset, including removing battery and draining the capacitors
-removed and replaced RAM modules
-tried tapping F9, 10, and 11 (read different instructions online) while trying to boot up