QUOTE(nothingz @ Apr 28 2011, 09:33 AM)
i had the same problem on my 2 years old Compaq laptop on random occasion, i sent back to HP for warranty then they changed the motherboard for me, they even detected the HDD got problem then changed it for me too.
it may be due to the RAM stick was not properly plugged in, even such incident happens on desktop, the PC cannot boot
at least desktop pc got warning beep..
we can know hardware issue from the beep

Added on April 28, 2011, 11:08 amjust to share..from
hp support manualSymptom 3: LEDs glow, fan noise may be heard briefly, display remains black, and
computer fails to startup or boot
Usually occurs if a component is installed incorrectly, or there is a device conflict or failure.
Connect an external monitor to check if the problem is the built-in LCD display or graphics
card.
Remove all CD/DVDs, SD cards, USB devices, peripherals and do a Hard Reset.
If memory or hard drive components were replaced, reinstall original components.
Remove memory modules and replace one-at-a-time.
Remove and reseat hard drive.
If possible, turn on power, press F10 to enter BIOS mode, and run Memory Test and
Hard Drive Test.
On newer notebooks, turn on power, press Esc to enter UEFI mode, and run Memory
Test and Hard Drive Test.
If possible, turn on power, press F8 to enter Windows Advanced Boot Options, and
select Repair Computer option, or enter Safe Mode and run Memory Diagnostics.
If all other methods fail, but computer can boot to BIOS, use recovery disk to recover
the computer to original condition.
Note: All programs and data are destroyed during recovery.
hmm..possible coming from ram..as the latest component installed
This post has been edited by sendoh_7: Apr 28 2011, 11:08 AM