TMR2 failure to boot

I have a computer that has not been on in 11 months.  When I try to boot, it says on
a black screen "Previous attempts at booting this system have failed at checkpoint
(Tmr2).  For help on this problem, contact Dell Tech Support."

Anyone out there who knows what to do?
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☠ MASQ ☠Commented:
TMR2 is a RAM/Motherboard error but it could also be caused by a CMOS error - if the machine has been off for that long and wasn't new when last used there's a chance the CMOS battery may be flat and the BIOS settings are messed up.

1) Check the model - it may also have a diagnostics light system built into the motherboard that will help with pinning down what's wrong.

2) It will do no harm to remove and resert the RAM modules

3) If you have a replacment CMOS battery try using that and look for a Restore Default Settings option in the BIOS.

Can be more help if we know what model of Dell this is - Service Tag ideally.

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cmdmanAuthor Commented:
Service tag is BW5XG51.  It is a Dell Optiplex  GX270
Check the capacitors on the motherboard.
It's a typical problem with GX motherboards and I see that Dell was replacing those boards for free prior to 2009 or so. It could also be a or worn out power supply fan.
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☠ MASQ ☠Commented:
The GX270 has a diagnostic LED system built onto the motherboard, if you look at the back of the case (depending on the format) you'll find four lights labelled A-D (usually between the PS/2 sockets and VGA port) - once the machine is fully powered (even if you have the TMR2 error on the display) check these - they should all be green, if any are yellow let us know the combination - or you can check it here:
cmdmanAuthor Commented:
Hang with me guys.  I have had to go out of town on business and
will be back on Sep 12.

Very sorry for not responding by now.
cmdmanAuthor Commented:
Thanks guys.  Sorry I dropped the ball on my end.
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