HP desktop won't start, red light flashing and beeping, loud fan

Yesterday it was working just fine. I turned it off for the night and when I tried to turn it on this morning, a red light was flashing and beeping as well as the fan making a loud humming noise. I've read the the beeping and flashing means something. I didn't keep track of the number of flashes and beeps though. After the beeping and flashing I turned the computer off then back on. This time there was no red light, flashing, or beeping. Nothing appeared on the monitor either. After about 10-20 seconds of it being on, the fan started to hum really loudly again.
It's an HP Compaq dc7900. I've only had it for about 3 months and it was fine up until now.
Any help? Thanks.

Hi
I'v checked the specs for your HP and Acer machines and yes it will be fine to cross over RAM modules they are identical in speed and architecture . Please don't forget the last post about removing the sources of power before you go inside the PC to check RAM . Other thing is if your HP has more than one RAM module remove only one stick first and try to boot . If it still won't boot with that module take that one out and try to boot from the other before you look to swap over modules from Acer machine . Don't forget to re connect your monitor to see if you get display with one / two etc modules . Post me back your findings
Checkurtech
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Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
Join our BBM Channels
BSCF General Channel
PIN: C0001B7B4 Display/Scan Bar Code
Knowledge Base Updates
PIN: C0005A9AA Display/Scan Bar Code

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