HP xw6400 Workstation doesn't Boot Up

My husband has a HP XW6400 workstation won't boot to the top.  Two beeps four times during a red light on the front flashes four times, or it will be as it tries to start, stop, and then resume, then stop.  Once he has me completely in the Windows 7 boot screen, then turns off.  We have removed the RAM & reset, but it does not solve the problem.  Any suggestions on what could be the problem?

The last time he tried starting, a black screen came with rerarding of different options start in safe mode, repair mode, etc.  He chose safe mode & that's when he started having this problem.

He went to the store to get a new CMOS battery for it.

Thank you!

Kim Rinde

It's the kind of help your Boyfriend... Here is some info.

The diagnostic model beep by HP in their workstations has been fairly constant.  4 beeps then 2 second pause, and means a power failure in the broad sense.  Food can be very good, but something attached to it can cause problems and point the finger food.  There is a safety circuit at the top end power supplies that can cut them very quickly... a "crowbar circuit.  Go to the search bar who said 'Search in the HP Forum' and type in 'crowbar', and then "4 beeps".  You will see a little info.

If you google xw6400 technical and manual repair you can find a searchable PDF version of this document and get added information when you do a search in there for 4 beeps.  It tells you how to test that the power is good or not... I met the 4 beeps in the past and it was a bad power supply only once (usually, it's something else down the line that causes the same fault-circuit activate).  HP power supply replacements are cheap off eBay as companies out of these and get them out.  In my case there was some video cards causing the crowbar circuit activate, so also try a spare video card if you have one.  Pretty much whatever it is connected to the power supply can trigger, but it is rare to be triggered internally.

Better to completely disconnect (power and data cables), but the basics and build backups since then.  You can usually find the culprit in this way (assuming that it is not the power supply itself).

Let us know what it was... the CMOS battery is not likely the issue.  Good to replace those every time than in quite awhile, so no loss.

Tags: HP Desktops

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