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It's unlikely that you have 2 or more defective memory modules. Remove all cards such as video, modem, etc. Also disconnect all drives (hard drive, CD, DVD). Try booting with one memory module at a time. If still a no go then I would suspect the motherboard.
there is the possibility your memory was not seated correctly and/or it is not the correct memory.
remove it to get going again ...
256 is a strange number ...
please go to www.4allmemory.com and have them scan your computer. They will make recommendations based on that scan. Compare what you got with their recommendation.
Remove the original module, install just the new one and then start your computer. If it doesn't start, the memory you bought is bad. The system boards used in the Compaqs will auto-detect memory, and there are no jumpers or BIOS settings needed.
500Mhz CPU use DDR333/400 memories. majority are used in MAC.
800Mhz CPU use DDR2 400/533/667 Mhz.
look like either you cna change the CPU or change meories again to match them up.
You can install up to 3 sticks of 512 mb of memory. Did you add a 256 stick to the already-existing 128? You need to put DDR266/PC2100 memory. To troubleshoot, remove the 128 stick and put your 256 in and see if it is recognized. You will know right away from the bios screen. Memory needs to be the same type.
Did you already try using last know good configuration?
When your computer boots instead of f10 press F8. Then select last known good configuration and enter.
if it didn't work try booting up the computer without the memory see if it will have the same problem.
Firstly the keyboard does blink, but do you hear 2 beeps one then another a few seconds later, if not memory or graphics fault.
Are you able to start in safe mode(press F8 when pc is booting up)when menu comes up highlight 'Start windows with last known good configuration' then press enter and it should re boot.
The graphics card(if it's not onboard)may need to be removed and re seated, also the memory.
Also check hard disk drive ide and power cable.
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